#include<fstream>
#define LL long long
using namespace std;
ifstream f("frac.in"); ofstream g("frac.out");
LL p,n,k,d[11];
LL nr(LL x)
{   LL r=0;
    for(LL prod,sgn,i=0;i<(1LL<<k);++i)
    {   prod=sgn=1;
        for(LL j=0;j<k;++j)
            if((i&(1<<j)) != 0) prod*=d[j], sgn*=-1;
        r+=sgn*x/prod;
    }
    return r;
}
LL caut()
{   LL i,pas=1LL<<60;
    for(i=0;pas;pas>>=1)
        if(nr(i+pas)<p) i+=pas;
    return i+1;
}
int main()
{   f>>n>>p;
    for(LL i=2;i*i<=n;++i)
        if (n%i==0)
        {   d[k++]=i;
            while(n%i==0) n/=i;
        }
    if(n>1) d[k++]=n;
    g<<caut()<<'\n'; g.close(); return 0;
}