#include<iostream>
using namespace std;
int exgcd(int a,int b,int &x,int &y)
{
if(b==0)
{
x=1;
y=0;
return a;
}
int r=exgcd(b,a%b,x,y);
int t=x;
x=y;
y=t-a/b*y;
return r;
}
int fuck(int a,int b,int c,int &x,int &y)
{
int d=exgcd(a,b,x,y);
if(c%d)
return 0;
int count=0;
int k=c/d;
x*=k;y*=k;
int tempx=x,tempy=y;
int b1=b/d,a1=a/d;
// cout<<"!x="<&l......
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