cf 495b Modular Equations

#include<cstdio>
#include<cmath>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
  int a,b,x;
  while(scanf("%d%d",&a,&b)!=EOF)
  {
    if(a<b)
    {
      printf("0\n");
    }
    else if(a==b)
    {
      printf("infinity\n");
    }
    else
    {
      int i,ans=0;
      int cha=a-b;
      for(i=1;i*i<cha;i++)
      {
        if(cha%i==0)
        {
          if(i>b) ans++;
          if(cha/i>b) ans++;
        }
      }
      if(i*i==cha&&i>b) ans++;
      printf("%d\n",ans);
    }

  }
  return 0;
}