# can't figure out mistake in this code

This is my solution for the Factorial problem under the Practice < Easy section.
I’m getting wrong answer when i submit.

#include<stdio.h>
#include<math.h>
long int fact (long int);
int main ()
{
long int t;
long int i;

scanf("%ld",&t);
if(t>100000);
else{
long int arr[t];

for(i=0;i<t;i++)
scanf("%ld",&arr[i]);
for(i=0;i<t;i++)
{if(arr[i]>1000000000||arr[i]<1);
else
printf("%ld\n",fact(arr[i]));
}}
return 0;
}

long int fact (long int x)
{
long int i=1,term;
long int sum=0;
while(term>=1)
{ term=x/pow(5,i);
sum=sum+term;

``````    i++;
}

return sum;
``````

}

Your code gives Wrong Output for:

```Input
1000000000

Expected Output:
249999998

249999997
```

How should I fix this ?
And how did you figure this thing out that I’m getting wrong output for this specific input ?
(sorry I’m new here)

I have tested some test cases against your code and my AC’ed code, and so i got the test case for which your code failed

See this was my logic:

`val =((num/5) + (num/25) + (num/125) + (num/625) + (num/3125) + (num/15625) + (num/78125) + (num/390625) + (num/1953125) + (num/9765625) + (num/48828125) + (num/244140625) + (num/1220703125) );`

I computed all 5^i according to constraints and solved the problem.