#include <iostream>
#include <cstdio>

using namespace std;
int t,a,n,c;

int smek(int &x,int &y,int a,int b)
{
    if (!b)
        return a;
    int r=a%b;
    smek(x,y,b,r);
    int aux=x;
    x=y;
    y=aux-a/b*y;

}

void rezolv()
{
    scanf("%d%d",&a,&n);
    int x=1,y=0,d,k;
    d=smek(x,y,a,n);
    while (x<0)
    {
        x+=n;
    }

    printf("%d",x);



}
int main()
{

    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    rezolv();
    return 0;
}