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#include <bits/stdc++.h>
#include <fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int a,b,x,y;
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-a/b*y1;
}
}
int main()
{
fin>>a>>b;
euclid(a,b,x,y);
while(x<0)
x+=b;
fout<<x;
return 0;
}