#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    string s, t;
    int A, B, d;
    cin >> s >> t;
    A = stoi(s);
    A %= 12;
    B = stoi(t);
    //短針:p=1秒1/120秒
    //長針:q=1秒1/10度
    //A時B分
    //pp=A*30+B*0.5
    //qq=B*6

    // (q-p)*x <= d < (q-p)*(x+1)
    // x = floor(d/(q-p))
    // x = floor(120d/(120q-120p))
    //120q-120p = 11
    //120d = A*3600+B*60-B*720 (+360*120)

    d = A*3600+B*60-B*720;
    if (d < 0) d += 360*120;

    cout << d/11 << endl;

    return 0;
}