#include <cstdio>

using namespace std;
int ep,p,q;
int descompunere(int n)
{
    int d=2,e;
    while(n>1)
    {
        while(n%d==0)
        {
            n=n/d;
            e++;
        }
        if(d%p==0 || p%d==0)
            ep=ep+e;
        d++;
    }
}
int main()
{
    freopen("gfact.in","r",stdin);
    freopen("gfact.out","w",stdout);
    int i;
    scanf("%d%d",&p,&q);
    for(i=1;ep<q;i++)
        descompunere(i);
    printf("%d",i-1);
    return 0;
}