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#include <fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
void Euclid(int a, int b, int &d, int &x, int &y)
{
if(b==0) { d=a; x=1; y=0; }
else
{
int x0, y0;
Euclid(b, a%b, d, x0, y0);
x=y0;
y=x0-(a/b)*y0;
}
}
int main()
{
int T, a, b, x, y, d, i, c;
fin>>a>>b;
Euclid(a, b, d, x, y);
//if(c%d!=0)
// fout<<"0 0\n";
// else fout<<x*(c/d)<<" "<<y*(c/d)<<"\n";
fout<<x<<"\n";
fin.close();
fout.close();
return 0;
}