#include <iostream>

using namespace std;

int cmmdc(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return a;
    }
    int d=cmmdc(b,a%b,x,y);
    int aux=x;
    x=y;
    y=aux-y*(a/b);
    return d;
}

int main()
{
    int a,mod,x,y;
    cin>>a>>mod;
    cmmdc(a,mod,x,y);
    while(x<0)
        x=x+mod;
    cout<<x;
    return 0;
}