#include <fstream>

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

    return 0;
}