#include <stdio.h>
int main(void){
	long val = 0;
	scanf("%d",&val);
	
	int A, B, C;
	scanf("%d%d%d",&A, &B, &C);
	
	long ans = 0;
	
	ans += val / A;
	ans += val / B;
	ans += val / C;
	ans -= val / (A * B);
	ans -= val / (A * C);
	ans -= val / (B * C);
	ans += val / (A * B * C);
	
	printf("%ld",ans);
}