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#include<bits/stdc++.h>
using namespace std;

inline int calc(int d,int h,int m){
    int ans=(d*24+h)*60+m;
    if(d>29||d==29&&h>=3)ans-=60;
    return ans;
}

int main(){
    int x,d,h,m;
    scanf("%d%d%d%d",&x,&d,&h,&m);
    int t;
    if(x==1)t=calc(25,0,0);
    if(x==2)t=calc(26,0,0);
    if(x==3)t=calc(27,0,0);
    if(x==4)t=calc(28,0,0);
    if(x==5)t=calc(30,0,0);
    int ans=t-calc(d,h,m);
    printf("%d\n",ans);
    return 0;
}