#include <cstdio>

using namespace std;


void gcd(long long &x,long long &y,int a,int b)
{
    if(!b)
    {
        x=1;
        y=0;
    }
    else
    {
    gcd(x,y,b,a%b);
    long long aux=x;
    x=y;
    y=aux - y*(a/b);
    }
}

int main()
{
    long long x=0,y;

    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);

    int a,n;

    scanf("%d %d",&a,&n);

    gcd(x,y,a,n);

    if(x<=0)
        x=n+x%n;

    printf("%lld",x);

    return 0;
}