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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define st first
#define nd second
#define pii pair<int,int>
#define pb push_back
#define pf push_front
#define lll __int128
#define si size()
#define int ll
const int A=5e5+3;
bool vis[A];
int mom(int d,int g,int mi){
    int sum=0;
    sum+=1440*d;
    sum+=g*60;
    sum+=mi;
    return sum;
}
signed main(){
    ios_base::sync_with_stdio(0);
   cin.tie(0);
    int d,sum=0,x,h,m;
    vector<int>po(6);
    po[1]=mom(24,23,60);
    po[2]=mom(25,23,60);
    po[3]=mom(26,23,60);
    po[4]=mom(27,23,60);
    po[5]=mom(29,23,60);
    po[0]=mom(29,2,0);
    cin>>x>>d>>h>>m;
    int a=mom(d,h,m);
    if(x==5&&a<=po[0]) sum-=60;
    sum-=a;
    sum+=po[x];
    cout<<sum<<'\n';
    return 0; 
}