#include <iostream>
#include <vector>
using namespace std;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    string A, B;
    cin >> A >> B;
    int a = 0, b = 0;
    for(int i = 0; i < 2; i++){
        a = (A[i] - '0') + a * 10;
        b = (B[i] - '0') + b * 10;
    }
    a %= 12;
    double tyo = 360.0 / (60 * 60 * 12.0), ta = 360.0 / (60 * 60);
    double c  = a * 30.0 + (double)b / 2.0;
    double d = b * 6.0;
    int ans;
    if(c < d) ans = (c + 360 - d) / (ta - tyo) + 0.01;
    else ans = (c - d) / (ta - tyo) + 0.01;
    cout << ans << endl;
}