#include <stdio.h>

int main(void)
{
    int a,b,c,d,i,min = 100;
    int coef[3];
    scanf("%d%d%d%d",&a,&b,&c,&d);
    coef[0] = a;
    coef[1] = b/c;
    coef[2] = d/(1+c);
    for(i=0;i<3;i++){
        if(coef[i] < min){
            min = coef[i];
        }
    }
    printf("%d\n",min);
    return 0;
}