7-19 check denomination (solve binary linear equation)

A buyer went to the bank to exchange a y element f Split check , As a result, the cashier gave it to f element y branch . The buyer used n I didn't find anything wrong until I got a score , So I counted the balance and there was still 2y element 2f branch , Ask what the face value of the check is ？

Input format ：

The input gives less than... On one line 100 The positive integer n.

Output format ：

In one line by format y.f Output the original face value of the check . If there is no solution , The output No Solution.

sample input 1：

23

sample output 1：

25.51

sample input 2：

22

sample output 2：

No Solution

Brute force ：

#include<stdio.h>
int main()
{
 int n,y=0,f=0;
 scanf("%d",&n);
 //98f-n=199y;
 int i=0;
 for(y=0;y<100;y++)
  {
   for(f=0;f<100;f++)
   {
    if(98*f-n==199*y)
    {
     printf("%d.%d",y,f);
     i=1;
    }
   } 
  }
 if(i!=1)
 printf("No Solution\n");
 return 0;
}