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#include<iostream>
using namespace std;
int main()
{
    int x, d, h, m;
    cin>>x>>d>>h>>m;
    int w = 0;
    if(x < 5){
        w += (23+x-d)*1440;
        w += (23-h)*60;
        w += (60-m);
    }
    else{
        w += (29-d)*1440;
        w += (23-h)*60;
        w += (60-m);
        if(d<29||h<3) 
            w -= 60;
    }
    cout<<w<<'\n';
    return 0;
}