#include <iostream>
#include <cstdio>

using namespace std;

const int L = 30;

int r,p,q;
int pp(int r){
    int nr=0;
    while( r >= q  ){
            nr=nr+r/q;
            r=r/q;
        }
    return nr;
}

int main()
{
    FILE *fin, *fout;
    int n, i, pas, p;
    fin = fopen( "gfact.in", "r" );
    fout = fopen( "gfact.out", "w" );
    fscanf(fin, "%d%d", &p, &q );
    pas = 1<<L;
    r = 0;
    while( pas > 0 ){
        if( pp(r+pas) < q-1 )
            r = r + pas;
        pas = pas / 2;
    }
            fprintf( fout, "%d", r-1 );

    fclose(fin);
    fclose(fout);
    return 0;
}