#include <iostream>
#include <cstdio>

using namespace std;

int a,b;
int n;

void cmmdc(int a, int b,int &x,int &y)
{
    int x1,y1;
    if (b == 0)
    {
        x=1;
        y=0;
        return;
    }
    cmmdc(b,a%b,x1,y1);
    x=y1;
    y=x1-y1*(a/b);
}

void citire()
{
    int x,y;
    scanf("%d %d",&a,&n);
    cmmdc(a,n,x,y);
    if (x<0)
        printf("%d",x+n);
    else
        printf("%d",x);

}

int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    ///int x,y,d;
    ///cmmdc(12,2,d,x,y);
    ///printf("%d %d",x,y);
    citire();
    return 0;
}