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

int main() { int a, b; cin >> a >> b; if (b > a) { cout << (b - a) * 30; } else if (a > b) { cout << (a - b) * 30; } return 0; }

#include <iostream>
using namespace std;

int main() {
    int m, n;
    cin >> m >> n;
    cout << (n - m) * 30;
    return 0;
}