#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int howManyGames(int p, int d, int m, int s) {
    // Return the number of games you can buy
    int sum=0,count=0;
    int a[20]={20,17,14,11,8,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6};
    for(int i=0;i<20;i++)
    {
        sum = sum + a[i];
        if(sum<=s)
        {
            count++;
        }
    }
    return count;
}

int main() {
    int p; 
    int d; 
    int m; 
    int s; 
    scanf("%i %i %i %i", &p, &d, &m, &s);
    int answer = howManyGames(p, d, m, s);
    printf("%d\n", answer);
    return 0;
}