#include <iostream>
#include <stdio.h>

using namespace std;

int a,b,x,y;


void euclid(int a, int b, int &x, int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return;
    }

    int x0,y0;
    euclid(b,a%b,x0,y0);
    x=y0;
    y=x0-(a/b)*y0;

}


void citire()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d %d",&a,&b);
    euclid(a,b,x,y);
    while(x<0)
        x+=b;
    printf("%d",x);
}

int main()
{
    citire();
    return 0;
}