#include<bits/stdc++.h>
#define int long long
using namespace std;
int dat[]={0,3927,7854,11781,15709,19636,23563,27490,31418,35345,39272,43200};
signed main(){
    int A,B;
    cin>>A>>B;
    A%=12;
    int N=A*3600+B*60;
    cout<<*lower_bound(dat,dat+11,N)-N<<endl;
}