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#include "bits/stdc++.h"

#define all(v) (v).begin(), (v).end()
#define st first
#define nd second
#define printv(a) { for(auto u : a) cout<<u<<" "; cout<<"\n"; }
#define debug(x) cerr << #x << " = " << x << '\n';

using namespace std;
using ll = long long;
using pii = pair<int,int>;
using vi = vector<int>;
using si = set<int>;
using mii = map<int,int>;

const int H = 60, D = 1440;

vector<int> kon = {2880, 4320, 5760, 7200, 7200 + D*2 - 60};


int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int x,d,h,m;
    cin>>x>>d>>h>>m;
    int k = kon[x-1];
    int p = (d - 23) * D;
    p += h * H;
    p += m;
    if(d == 29 && h > 2) p -= 60;
    cout<<k - p<<endl;
    return 0;
}