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#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define vec vector
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

void slv(){
	int r,d,h,m;
	cin>>r>>d>>h>>m;

	int ans=0;
	if(r!=5){
		int total=36*60;
		int s=h*60+m;
		if(r==1 and d==24){
			s+=24*60;
		}
		if(r==2 and d==25){
			s+=24*60;
		}
		if(r==3 and d==26){
			s+=24*60;
		}
		if(r==4 and d==27){
			s+=24*60;
		}
		s-=12*60;
		ans=total-s;
	}else{
		int total=(36+24)*60;
		int s=h*60+m;
		s-=12*60;
		if(d>=28){
			s+=24*60;
		}
		if(d==29){
			s+=24*60;
		}
		if(!(d==29 and h>=2)){
			s+=60;
		}
		ans=total-s;
	}
	cout<<ans<<"\n";
}

signed main(){
	ios::sync_with_stdio(0),cin.tie(0);

	int t;
	t=1;
	// cin>>t;

	rep(cs,t){
		slv();
	}
}