#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (int)n; i++)
using ll = long long;
const ll INF = 1e17;

template<typename T, typename E, typename F, typename G, typename H>
class LazySegmentTree {
  int n, height;
  F f; G g; H h; const T ti; const E ei;
  vector<T> dat; vector<E> laz; vector<int> highest;

  void propagate(int k) {
    if(laz[k] != ei) {
      laz[2*k] = h(laz[2*k],laz[k]); laz[2*k+1] = h(laz[2*k+1],laz[k]);
      dat[k] = g(dat[k],laz[k],n/highest[k]);
      laz[k] = ei;
    }
  }
  inline void recalc(int k) {
    while(k >>= 1) dat[k] = f(g(dat[2*k],laz[2*k],n/highest[2*k]),g(dat[2*k+1],laz[2*k+1],n/highest[2*k+1]));
  }
  inline void thrust(int k) {
    for(int i = height; i > 0; i--) propagate(k >> i);
  }
public:
  LazySegmentTree(int _n, F f, G g, H h, T ti, E ei): f(f), g(g), h(h), ti(ti), ei(ei) {
    n = 1; height = 0;
    while(n < _n) n <<= 1, height++;
    dat.assign(2*n,ti); laz.assign(2*n,ei); highest.assign(2*n,0);
    int c = 1;
    for(int i = 1; i < 2*n; i++) {
      if(c*2 <= i) c <<= 1;
      highest[i] = c;
    }
  }
  void set(int k, T x) {
    dat[k+n] = x;
  }
  void build() {
    for(int i = n-1; i >= 0; i--) {
      dat[i] = f(dat[2*i],dat[2*i+1]);
    }
  }
  void update(int a, int b, const E x) {
    thrust(a += n); thrust(b += n-1);
    for(int l = a, r = b + 1; l < r; l >>= 1, r >>= 1) {
      if(l & 1) laz[l] = h(laz[l],x), ++l;
      if(r & 1) --r, laz[r] = h(laz[r],x);
    }
    recalc(a); recalc(b);
  }
  T query(int a, int b) {
    thrust(a += n); thrust(b += n-1);
    T l = ti, r = ti; b++;
    while(a < b) {
      if(a & 1) l = f(l,g(dat[a],laz[a],n/highest[a])), a++;
      if(b & 1) b--, r = f(g(dat[b],laz[b],n/highest[b]),r);
      a >>= 1; b >>= 1;
    }
    return f(l,r);
  }
};

int main(){
  int n, q;
  cin >> n >> q;
  auto f = [](ll a, ll b){return a+b;};
  auto g = [](ll a, ll b, int l){return b == INF ? a : b*l;};
  auto h = [&](ll a, ll b) {return b;};
  LazySegmentTree<ll,ll,decltype(f),decltype(g),decltype(h)> lst(n,f,g,h,0,INF);
  rep(i,n) lst.set(i,((ll)1<<31)-1);
  lst.build();
  vector<ll> ans;
  rep(i,q) {
    int t;
    cin >> t;
    if(t == 0) {
      int l, r; ll x;
      cin >> l >> r >> x;
      lst.update(l,r+1,x);
    } else {
      int p;
      cin >> p;
      ans.push_back(lst.query(p,p+1));
    }
  }
  for(auto x : ans) cout << x << endl;
  return 0;
}

#include <bits/stdc++.h>
#define mod 1000000007
#define sp ' '
#define intmax 2147483647
#define llmax 9223372036854775807
#define nyan "(=^･ω･^=)"
#define mkp make_pair
#define mkt make_tuple
#define lP pair<ll, ll>
#define iP pair<int,int>
typedef long long ll;
using namespace std;

int n, q, s, t, x, u;
iP a[1<<18];
bool b;

int update(int s, int t, int x, int k, int l, int r, int i) {
	if (t < l || r < s)return 0;
	else if (s <= l&&r <= t) {
		a[k] = mkp(x, i);
		return 0;
	}
	else {
		update(s, t, x, k * 2, l, (l + r) / 2, i);
		update(s, t, x, k * 2 + 1, (l + r) / 2 + 1, r, i);
		return 0;
	}
}
int find(int x) {
	int y, z = -2;
	x += u;
	while (x) {
		if (z < a[x].second) {
			y = a[x].first;
			z = a[x].second;
		}
		x /= 2;
	}
	return y;
}


int main(){
	cin >> n >> q;
	for (int i = 1;; ++i) {
		if ((1 << i) / n >= 2) {
			u = (1 << i - 1);
			break;
		}
	}
	for (int i = 1; i != u * 2; ++i)
		a[i] = mkp(intmax, -1);
	for (int i = 0; i != q; ++i) {
		cin >> b >> s;
		if (b) {
			cout << find(s) << endl;
		}
		else {
			cin >> t >> x;
			update(s, t, x, 1, 0, u - 1, i);
		}
	}
	return 0;
}

