#include <stdio.h>
int main(void){
	long val = 0;
	scanf("%ld",&val);
	// 倍数
	int A, B, C;
	scanf("%d%d%d",&A, &B, &C);
	
	int count = 0;
	for(int i = 1;i <= val;i ++){
		if(i % A == 0){
			count++;
		}else if(i % B == 0){
			count++;
		}else if(i % C == 0){
			count++;
		}
		
		if(i % (A * B) == 0){
			count--;
		}else if(i % (A * C) == 0){
			count--;
		}else if(i % (C * B) == 0){
			count--;
		}else if(i % (A * B * C) == 0){
			count -= 2;
		}
	}
	printf("%d",count);
}