#include <bits/stdc++.h>
#define rep(i,n)for(long long i=0;i<(long long)(n);++i)
#define all(a) a.begin(), a.end()
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
 
const ll MOD=1e9+7;
const ll INF=1e18;
const double pi=acos(-1);
int dx[8] = {1,0,-1,0,1,1,-1,-1};
int dy[8] = {0,1,0,-1,-1,1,1,-1};

const int MAX=510000;
int main(){
  cin.tie(0);
  ios::sync_with_stdio(false); 
  
  int a,b,c,d;
  cin >> a >> b >> c>> d;
  b+=60*a;
  d+=60*c;
  int k;
  cin >> k;
  if(d-b>=k)cout << d-b-k << endl;
  else cout << 0 << endl;
  return 0;
}
#include <bits/stdc++.h>
using namespace std;
#define repl(i, l, r) for (ll i = (l); i < (r); i++)
#define rep(i, n) repl(i, 0, n)
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define CST(x) cout << fixed << setprecision(x)
using ll = long long;
const ll MOD = 1000000007;
const int inf = 1e9 + 10;
const ll INF = 4e18 + 10;
int main() {
	cin.tie(0);
	cout.tie(0);
	ios::sync_with_stdio(false);

	int a, b, c, d, k;
	cin >> a >> b >> c >> d >> k;
	cout << c * 60 + d - a * 60 - b - k << endl;
	return 0;
}