#include <fstream>
#include <bitset>
#include <vector>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

int a,n,v1,v2;
void Euclid(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=1; y=0;
    }
    else
    {
        Euclid(b,a%b,x,y);
        int cx=x;
        x=y;
        y=cx-y*(a/b);
    }
}

int main()
{
    fin>>a>>n;
    Euclid(a,n,v1,v2);
    while(v1<=0) v1+=n;
    fout<<v1;
    return 0;
}