#include <stdio.h>

using namespace std;
FILE *f,*g;
int n,a,x,y;
void modular(int &x,int &y,int a,int n)
{
    int aux;
    if(n==0)
    {
        x=1;
        y=0;
    }
    else
    {
        modular(x,y,n,a%n);
        aux=x;
        x=y;
        y=aux-y*(a/n);
    }
}
int main()
{
    int i;
    f=fopen("inversmodular.in","r");
    g=fopen("inversmodular.out","w");
    fscanf(f,"%d %d",&a,&n);
    modular(x,y,a,n);
    while(x<0)
        x+=n;
    fprintf(g,"%d",x);
    return 0;
}