#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
  string s;
  cin >> s;
  int ans = 100000;
  for (int i = 0; i < s.size() - 2; i++) {
    string u = s.substr(i, 3);
    int a = stoi(u);
    ans = min(ans, abs(a - 753));
  }
  cout << ans << endl;
	return 0;
}