#include <iostream>
#include <cstdio>
using namespace std;

int n, a, b, c, k, l;

void EuclidExtins(int a, int b, int &k, int &l)
{
    if(b==0)
        k=1, l=0;
    else
    {
        int kp, lp;
        EuclidExtins(b, a%b, kp, lp);
        k=lp;
        l=kp-lp*(a/b);
    }
}

int main()
{
    freopen("inversmodular.in", "r", stdin);
    freopen("inversmodular.out", "w", stdout);
    cin>>a>>b;
    EuclidExtins(a, b, k, l);
    if(k<=0){
        k=b+k%b;
    }
    cout<<k;
    return 0;
}