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#include <bits/stdc++.h>
using namespace std;
int euclid(int a, int b, int &x, int &y)
{
if(b==0)
{
x=1;
y=0;
return a;
}
int x0,y0,d;
d=euclid(b,a%b,x0,y0);
x=y0;
y=x0-y0*(a/b);
return d;
}
int main()
{
int x,y,d,a,b,n;
ifstream fin("euclid3.in");
ofstream fout("euclid3.out");
fin>>a>>n;
b=n;
d=euclid(a,b,x,y);
while(x<=0)
x+=n;
fout<<x;
fin.close();
fout.close();
return 0;
}