#include<stdio.h>
using namespace std;

FILE *in=fopen("inversmodular.in","r"),*out=fopen("inversmodular.out","w");
void euclid(int a,int b,long long &x,long long &y)
{
    if(!b)
    {
        x=1;y=0;
    }
    else
    {
        euclid(b,a%b,x,y);
        long long aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}
int main()
{
    long long inv=0,ins;
    int a,n;
    fscanf(in,"%d %d",&a,&n);
    euclid(a,n,inv,ins);
    if(inv<0)
        inv=n+inv%n;
    fprintf(out,"%lld\n",inv);
    return 0;
}