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#include <bits/stdc++.h>
using namespace std;
ifstream in("inversmodular.in");
ofstream out("inversmodular.out");
int Euclid(long long a, long long b, long long &x, long long &y)
{
if(b==0)
{
x=1;
y=0;
return a;
}
else
{
long long x0,y0;
long long d=Euclid(b,a%b,x0,y0);
x=y0;
y=x0-1LL*(a/b)*y0;
return d;
}
}
int main()
{
long long a,n;
in>>a>>n;
long long x,y,d;
d=Euclid(a,n,x,y);
if(x<0) x=n+x%n;
out<<x;
in.close();
out.close();
return 0;
}