#include<bits/stdc++.h>
using namespace std;
int main()
{
    vector<int>arr;
    arr.push_back(3600+5*60+27);
    arr.push_back(2*3600+10*60+55);
    arr.push_back(3*3600+21*60+22);
    arr.push_back(4*3600+21*60+49);
    arr.push_back(5*3600+27*60+17);
    arr.push_back(6*3600+32*60+44);
    arr.push_back(7*3600+38*60+11);
    arr.push_back(8*3600+43*60+38);
    arr.push_back(9*3600+49*60+6);
    arr.push_back(10*3600+54*60+33);
    arr.push_back(0);
    int ans = 1e9;
    int a, b;
    cin >> a >> b;
    a = a % 12;
    int total = a*3600 + b * 60;
    //cout << total << endl;
    for(int i=0; i<arr.size(); i++)
    {
        if(arr[i]-total>=0)
        {
            ans = min(ans,arr[i]-total);
        }
    }
    cout << ans << endl;
}