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#include <bits/stdc++.h>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int A,N;
void ee(long long &x, long long &y, int a, int b)
{
if(!b)
x=1,y=0;
else
{
ee(x,y,b,a%b);
long long aux=x;
x=y;
y=aux-y*(a/b);
}
}
int main()
{
long long inv=0,ins;
f>>A>>N;
ee(inv,ins,A,N);
if (inv<=0)
inv=N+inv%N;
g<<inv;
return 0;
}