#include #include #include #include

using namespace std;

int main() {

string n;
cin >> n;


int min_diff = INT_MAX;
const int target = 753; 



for (int i = 0; i <= n.length() - 3; ++i) {

    string three_digits_str = n.substr(i, 3);

    int three_digits = stoi(three_digits_str);

    int diff = abs(three_digits - target);
    if (diff < min_diff) {
        min_diff = diff;
    }
}

cout << min_diff << endl;

return 0;

}