#include <bits/stdc++.h>

using namespace std;

void euclid(int a, int b, int &x, int &y){
    if(b==0) x=1, y=0;
    else{
        int x0,y0;
        euclid(b,a%b,x0,y0);
        x=y0;
        y=x0-a/b*y0;
    }
}

int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);

    int a,n,x,y;
    scanf("%d%d",&a,&n);
    euclid(a,n,x,y);
    while(x<0) x+=n;
    printf("%d\n",x);

    return 0;
}