#include <cstdio>

using namespace std;
int a,n,x0,x1,x,r,c,aux;
int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d %d",&a,&n);
    x0=1;x1=0;
    aux=n;
    while(n!=0){
        r=a%n;
        c=a/n;
        a=n;
        n=r;
        x=x0-c*x1;
        x0=x1;
        x1=x;
    }
    x0%=aux;
    if(x0<0)x0+=aux;
    printf("%d",x0);

    return 0;
}