#include <bits/stdc++.h>

using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int n,a,i;
long long y,s=3;
void inv(long long &x,long long &y,int a,int b)
{
    if(!b)
    {
        x=1;
        y=0;
        return;
    }
    inv(x,y,b,a%b);
    i=x;
    x=y;
    y=i-(a/b)*y;
}
int main()
{
    fin>>a>>n;
    inv(s,y,a,n);
    if(s<0)fout<<s%n+n;
    else fout<<s;
    return 0;
}