#include <stdio.h>
int main(void){
	long long val;
	int division1, division2, division3;
	scanf("%lld%d%d%d",&val,&division1, &division2, &division3);
	
	long long count = 0;
	for(long long i = 1;i <= val;i ++){
		if(i % division3 == 0 || i % division2 == 0 || i % division1 == 0){
			count++;
		}
	}
	printf("%lld",count);
}