#include <iostream>
using namespace std;

int main() {
    int H, M;
    cin >> H >> M;
    int res = 0;

    for(int i = 1; i <= 10; i++) {
        M += 1;
        if(M == 60) {
            res += 2;
            M = 0;

            if(H == 23) {
                res += 2;
                H = 0;
            }
            else if(H == 9 or H == 19) {
                res += 2;
                H++;
            }
            else {
                res++;
                H++;
            }

        }
        else if(M % 10 == 0) {
            res += 2;
        }
        else {
            res++;
        }

    }

    cout << res << endl;
    return 0;
}