#include <iostream>
#include <string>
#include <math.h>
#include <vector>

using namespace std;

int min(int a, int b)
{
    return a < b ? a : b;
}

int perimeter(int x0, int y0, int x1, int y1, int x2, int y2)
{
    int first_side = sqrt(pow(x1 - x0, 2) + pow(y1 - y0, 2));
    int second_side = sqrt(pow(x2 - x0, 2) + pow(y2 - y0, 2));
    int thirst_side = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));

    return first_side + second_side + thirst_side;
}

bool is_power_five(int a)
{
    bool res = false;
    while(a % 5 == 0)
    {
        if (a == 5) { res = true; break; };
        a /= 5;
    }
    return res;
}

int task_3(vector <int> a)
{
    int cnt = 0;
    for (int i = 0; i < a.size(); i++)
    {
        cnt += is_power_five(a[i]) ? 1 : 0;
    }
    return cnt;
}

bool polindrom(string a)
{
    string tmp = a;
    reverse(a.begin(), a.end());
    return a == tmp ? true : false;
}

int gcd(int a, int b)
{
    return !b ? abs(a) : gcd(b, a % b);
}

int sum(int a)
{
    if (a / 10 > 0) {return a % 10 + sum(a / 10);}
    else {return a;}
}

int digital_sqrt(int a)
{
    if (a / 10 > 0) {return digital_sqrt(sum(a));}
    else {return a;}
}

int main()
{

    //cout << digital_sqrt(625) << endl;

    //cout << gcd (6, 7) << endl;

    //cout << sum(125) << endl;

    // string a = "02020";

    // cout << polindrom(a) << endl;

    ////////////////////-task_3-///////////////

    // int buffer;
    // vector <int> seq;

    // do
    // {
    //     cin >> buffer;
    //     if (buffer == 0) break;
    //     seq.push_back(buffer);
    // } while (buffer != 0);

    // cout << task_3(seq) << endl;

    ////////////////////-task_3-///////////////

    // int a, b;

    // cin >> a >> b;

    // cout << 'minimal number is ' << min(a, b) << endl;

    return 0;
}