#include <bits/stdc++.h>

using namespace std;

int n,c;
int smek(int &x,int &y,int a,int b)
{
    if (!b)
        return a;
    int cmmdc=smek(x,y,b,a%b);
    int aux=x;
    x=y;
    y=aux-a/b*y;
}

int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    int d,k,x=1,y=0;
    scanf("%d%d",&c,&n);
    smek(x,y,c,n);
    while (x<0)
    {
        x+=n;
    }
    printf("%d",x);
    return 0;
}