#include <stdio.h>

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