Trailing Zeros in Factorial

Medium Number Theory & Mathematics
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Problem Statement

Write a C program to count the number of trailing zeros in the factorial of a given integer N.

Input Format

A single integer N.

Output Format

Print the count of trailing zeros in N!.

Constraints

1 <= N <= 10000

Sample Input

5

Sample Output

1

Explanation

5! = 120, which has 1 trailing zero.

Starter Code

#include <stdio.h>

int main() {
    int n;
    if (scanf("%d", &n) == 1) {
        // Write your code here
    }
    return 0;
}

Limits

  • Time Limit: 1s
  • Memory Limit: 256MB

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Updated: March 15, 2026
Intermediate

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