#include <stdio.h>

int main(void) {
	int i = 1, count = 0, N;
	int a, b, c;
	
	scanf("%d", &N);
	scanf("%d %d %d", &a,&b,&c);
	
	for(; i <= N; i++){
		if(!(i % a) || !(i % b) || !(i % c)){
			count++;
		}
	}
	
	printf("%d\n", count);
	return 0;
}