#include <bits/stdc++.h>
std::ifstream in("inversmodular.in");
std::ofstream out("inversmodular.out");
long long x,y,a,n;
void eucl(long long  a,long long b){
    if(!b){
        x=1;
        y=0;
        return;
    }
    eucl(b,a%b);
    int tmp=y;
    y=x-(a/b)*y;
    x=tmp;
}
int main()
{
    in>>a>>n;
    eucl (a,n);
    while(x<0)x+=n;
    out<<x;
    return 0;
}