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#pragma GCC optimize("O3")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
//using namespace __gnu_pbds;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using str = string;
 
//typedef tree<ll, null_type, less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update> oset;

void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
 
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ", "; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? ", " : ""), __print(i); cerr << "}"; }
void _print() { cerr << "]\n"; }

template <typename T, typename... V>
void _print(T t, V... v) { __print(t); if (sizeof...(v)) cerr << ", "; _print(v...); }

#ifdef LOCAL
#define debug(x...) cerr << "\e[91m"<<__func__<<":"<<__LINE__<<" [" << #x << "] = ["; _print(x); cerr << "\e[39m" << endl;
#else
#define debug(x...)
#endif

const ll mod = 998244353;
const ll infi  = 1e18+1;
const ld eps = 1e-14L;

int main(){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int x, d, h, m; cin >> x >> d >> h >> m;
    vector<int> last = {-1, 24, 25, 26, 27, 29};
    int czas = 24 * 60 * (last[x] - d) + 1440 - h * 60 - m;
    if(x == 5 && (d < 29 || (d == 29 && h < 2))) czas-=60;
    cout << czas << '\n';
    return 0;
}