#include <iostream>
using namespace std;

int calProd(int a, int b, int c, int N)
{
    int count = 0;
    int product = 1;
    while (product <= N)
    {
        product = a * b * c;
        
        count++;
    }
    return count;
}

int main()
{
    int N;
    cin >> N;

    int num1, num2, num3;
    cin >> num1;
    cin >> num2;
    cin >> num3;

    int product = calProd(num1, num2, num3, N);

    cout << product << endl;

    return 0;
}