#pragma GCC target "tune=native"
#pragma GCC optimize "O3"
#include <iostream>
using namespace std;
int main() {
    int n, a, b, c; cin >> n >> a >> b >> c;
    int i = n % a, j = n % b, k = n % c;
    int ans = 0;
    do {
        if (i == 0 or j == 0 or k == 0) ++ ans;
        if (i == 0) i = a;
        if (j == 0) j = b;
        if (k == 0) k = c;
        -- i;
        -- j;
        -- k;
    } while (-- n);
    cout << ans << endl;
    return 0;
}