#include <cstdio>

using namespace std;

int a,n;

void euclid(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=a;
        y=0;
    }
   else
   {
       euclid(b,a%b,x,y);
       int shm=x;
       x=y;
       y=shm-y*(a/b);
   }
}

int main()
{
    FILE *f=fopen("inversmodular.in","r");
    fscanf(f,"%d%d",&a,&n);
    int x,y;
    euclid(a,n,x,y);
    while(x<1)
        x+=n;
    fclose(f);
    f=fopen("inversmodular.out","w");
    fprintf(f,"%d",x);
    return 0;
}