/******************************************
* AUTHOR : GURUTEJA *
******************************************/
#include <bits/stdc++.h>
using namespace std;
#define LL long long
#define N 100005
#define MOD 1000000007
#define dd double
#define rep(i, n) for(int i = 0; i < n; i++)
#define REP(i,a,b) for(int i=a;i<b;i++)
#define rep1(i,b) for(int i=1;i<=b;i++)
#define pb push_back
#define mp make_pair
#define clr(x) x.clear()
#define sz(x) ((int)(x).size())
#define F first
#define S second

void debug(){
	#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif 

}

  int main() {
    debug();
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    string s,s1;	
    cin>>s;
    int x=1e9;
    for (int i = 0; i<s.length(); ++i)
    {
    	if(i<s.length()-2){
    		s1+=s[i],s1+=s[i+1],s1+=s[i+2];
    		x=min(x,abs(753-stoi(s1)));
    	}
    	s1.clear();
    }
    cout<<x<<endl;
    return 0;
  }

#include<bits/stdc++.h>
using namespace std;

#define fastio 			ios::sync_with_stdio(0);	cin.tie(0); cout.tie(0);  cout<<fixed;  cout<<setprecision(12);
#define randomINT 		mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
#define	newl 			cout<<"\n"
#define DISP(as)		for(auto it : as) cout<<it<<" ";newl;
#define DISP1(as)		for(auto it : as) cout<<it.f<<" "<<it.s<<") ";newl;
#define all(x)         	(x).begin(),(x).end()
#define mset(x,val)    	memset(x,val,sizeof(x))
#define newl           	cout<<"\n"
#define pb             	push_back
#define mp             	make_pair
#define f 				first
#define s 				second
#define dline          cerr<<"///REACHED///\n";
#define deb1(x)        cerr<<#x<<" = "<<x<<'\n';
#define deb2(x,y)      cerr<<'['<<#x<<','<<#y<<"] = "<<'['<<x<<','<<y<<']'<<'\n';
#define deb3(x,y,z)    cerr<<'['<<#x<<','<<#y<<','<<#z<<"] = "<<'['<<x<<','<<y<<','<<z<<']'<<'\n';

typedef long long 				ll;
typedef long double 			ld;
typedef vector<ll> 				vll;
typedef pair<ll , ll> 			pll;
typedef pair<ld, ld> 			pld;
typedef unordered_map<ll, ll> 	um;
typedef vector<pll> 			vpll;

const ll 	MAX5 	= 	2e+5 + 99;
const ll 	MAX7 	= 	1e+7 + 7;
const ll 	MAXN 	= 	MAX7;
const ll   	INF   	=  	0x7f7f7f7f7f7f7f7f;
const int  	INFi 	=  	0x7f7f7f7f;
const ll 	MOD		=  	1e+9 + 7;

// <------------- Declare Variables Here ------------> //

ll T = 1;
ll n, k, l, q, x;
string s;

ll a[600],c[505];
vpll b;
vll res;

// < ----------- func eh ---------------- ? //



// <------------- Start of main() -------------------> //

void MAIN() {
	cin>>s;
	ll mini = INF;
	for(ll i=0;i<s.length()-2;i++) {
		mini = min(mini , abs(stoll(s.substr(i,3)) - 753));
	}
	cout<<mini;
}

int main() {
	fastio; randomINT;
	//cin >> T;
	while (T--) {
		MAIN();
	}
	return 0;
}
