#include <iostream>

std::string input;

long long int GetLCM(long long int a, long long int b){
    long long int tmpA = a, tmpB = b;
    if(tmpA<tmpB){long long int tmp = tmpA; tmpA = tmpB; tmpB = tmp;}
    while(tmpA%tmpB!=0){long long int r = tmpA%tmpB; tmpA=tmpB; tmpB=r;}
    return a*b/tmpB;
}

int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(0);
    
    long long int n, a, b, c;
    std::cin >> n >> a >> b >> c;
    std::cout << n/a + n/b + n/c - n/GetLCM(a, b) - n/GetLCM(b, c) - n/GetLCM(c, a) + n/GetLCM(GetLCM(a, b), c)<< "\n";
    return 0;
}