#include <stdio.h>

using namespace std;
FILE *f,*g;
int main()
{
    long long a,n,n1,x=1,y=0,u=0,v=1,u1,v1,r,q;
    f=fopen("inversmodular.in","r");
    g=fopen("inversmodular.out","w");
    fscanf(f,"%lld %lld",&a,&n);
    n1=n;
    while (n)
    {
        q=a/n; r=a%n;
        u1=x-u*q; v1=y-v*q;
        a=n; n=r; x=u; y=v; u=u1; v=v1;
    }
    if (x<0) x=n1+x%n1;
    fprintf(g,"%lld\n",x);
    fclose(f);
    fclose(g);
    return 0;
}