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#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("euclid3.in");
ofstream out ("euclid3.out");
void euclid(int a , int b ,int & x ,int & y){
if (b==0){
x=1,y=0;
}
else{
int x1,y1;
euclid(b,a%b,x1,y1);
x=y1;
y=x1-y1*(a/b);
}
}
int main()
{
int n ;
int a,b,c,d;
int x,y;
in>>a>>b;
euclid(a,b,x,y);
while(x<0){
x+=b;
}
out<<x;
return 0;
}