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

int main() { int a,b,c,d; cin >> a >> b >> c >> d; int sum = a + b + c; int ans = sum % d; cout<<ans; return 0;

}

#include <bits/stdc++.h>
using namespace std;
#define LL long long
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int a , b , c , d;
int main()
{
	cin >> a >> b >> c >> d;
	int gh = a + b + c;
	cout << gh % d;
	return 0;
}
//菜鸟驿站
//老六专属

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