#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;

int main(){
	int i, j;
	long a, b, c, d;

	cin >> a >> b >> c >> d;


	a %= d;
	b %= d;
	c %= d;

	long long ans = 0, num = 1;

	if (a >= d || b >= d || c >= d) {
		if (a >= d) {
			num *= a;
		}
		if (b >= d) {
			num *= b;
		}
		if (c >= d) {
			num *= c;
		}

		cout << num%d << endl;
		return 0;
	}
	else {
		if (a + b + c >= d) {
			ans = (a + b + c) % d;
		}
		else {
			ans = a + b + c;
		}
	}


	

	cout << ans << endl;





	getchar();
	getchar();
	return 0;
}