#include <stdio.h>
#include <cstring>
#include <iostream>
using namespace std;
FILE *f,*g;
int a,b,x,y;
void invers_modular(int a, int b, int &x,int &y)
{
    int aux;
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        invers_modular(b,a%b,x,y);
        aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}
int main()
{
    f=fopen("inversmodular.in","r");
    g=fopen("inversmodular.out","w");
    fscanf(f,"%d %d",&a,&b);
    invers_modular(a,b,x,y);
    while(x<0)
        x+=b;
    fprintf(f,"%d",x);
    cout<<x;

    fclose(f);
    fclose(g);
    return 0;
}