#include <bits/stdc++.h>

using namespace std;

#ifndef LOCAL
string name="frac";
ifstream in(name+".in");
ofstream out(name+".out");
#define cin in
#define cout out
#endif // LOCAL

#define int long long

const int MV = 5e5+6;
const int MB = 61;

int n,p;
vector<int> pr;
vector<int> divs;

int c[MV];

void ciur()
{
    pr.push_back(2);
    for(int i=3;i<MV;i+=2)
    {
        if(c[i]==0)
        {
            pr.push_back(i);
            for(int j=i*i;j<MV;j+=i)
            {
                c[j]=1;
            }
        }
    }
}

int xprim(int x)
{
    int mm=(1<<divs.size());
    int ans=x;
    for(int i=1;i<mm;i++)
    {
        int me=1, mob=-1;
        for(int j=0;(1<<j)<=i;j++)
        {
            if((i>>j)&1) me*=divs[j], mob=-mob;
        }
        ans=ans-(x/me)*mob;
    }
    return ans;
}

int32_t main()
{
    ciur();
    cin>>n>>p;
    int aux=n;
    for(auto e:pr)
    {
        bool ok=0;
        while(aux%e==0)
        {
            ok=1;
            aux/=e;
        }
        if(ok) divs.push_back(e);
    }

    int st=1, dr=(1ll<<MB);
    int mid=(st+dr)/2;

    while(st!=dr)
    {
        if(xprim(mid)<p) st=mid+1;
        else dr=mid;
        mid=(st+dr)/2;
    }

    cout<<mid<<'\n';

    return 0;
}