#include <iostream>
#include<algorithm>
#include<time.h>
using namespace std;
void rec(int x, int y, int z, int w, int& count, int sum=0,int chet=0) {
	if (sum == w) {
		count ++;
		return;
	}
	if (sum > w) {
		return;
	}
	if (sum + x <= w and chet <=1) {
		rec(x, y, z, w, count, sum + x,1);
	}
	if (sum + y <= w and chet <=2) {
		rec(x, y, z,w, count, sum + y,2);
	}
	if (sum + z) {
		rec(x, y, z, w, count, sum + z,3);
	}
}
int main()
{
	int x, y, z, w, count = 0;
	cin >> x >> y >> z >> w;
	rec(x, y, z, w, count);
	cout << count;
}