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#include <fstream>
using namespace std;
ifstream is("inversmodular.in");
ofstream os("inversmodular.out");
int Modul( long long a, long long n );
int main()
{
long long A, N;
is >> N >> A;
os << Modul ( N, A );
is.close();
os.close();
return 0;
}
int Modul( long long a, long long n )
{
for ( long long i = 1; i < n; ++i )
if ( a * i % n == 1 )
return i;
}