trailing zeros of factorial

#include<bits/stdc++.h>
using namespace std;
int fives(int n)
{
    int k=(log(n)/log(5));
     //cout<<k;
    return ((1-(pow(0.2,k)))/4)*n;
}
int main()
{
    int n;
    cin>>n;
    vector<int> v;
    for(int i=0;i<n;i++)
    {
        int temp;
        cin>>temp;
        v.push_back(fives(temp));
    }
    for(auto x:v)
    {
        cout<<x<<endl;
    }
}