#include <fstream>
#define ll long long
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void gcd(ll & x,ll & y, int a, int b)
{if(b==0)
{   x=1;
    y=0;
}
else
{  gcd(x,y,b,a%b);
    ll aux=x;
    x=y;
    y=aux-y*(a/b);
}
}
int main()
{  ll x=0,y;
    int a,n;
    f>>a>>n;
    gcd(x,y,a,n);
    if(x<=0)
        x=n+x%n;
    g<<x;
    return 0;
}