Some coins and vending machine

# include <iostream>
using namespace std;
#include <iomanip>
#include <math.h>
#include <cmath>
#include <string>

int main()
{
    double sum;
    cin >> sum;
    sum = round(sum * 100);
    int twoleva = 200;
    int oneleva = 100;
    int fiftycoins = 50;
    int twentycoins = 20;
    int tencoins = 10;
    int fivecoins = 5;
    int twocoins = 2;
    int onecoin = 1;
    int counter = 0;
    while (sum > 0) {
        while (sum - twoleva >= 0) {
            sum -= twoleva;
            counter++;
        }
        while (sum - oneleva >= 0) {
            sum -= oneleva;
            counter++;
        }
        while (sum - fiftycoins >= 0) {
            sum -= fiftycoins;
            counter++;
        }
        while (sum - twentycoins >= 0) {
            sum -= twentycoins;
            counter++;
        }
        while (sum - tencoins >= 0) {
            sum -= tencoins;
            counter++;
        }
        while (sum - fivecoins >= 0) {
            sum -= fivecoins;
            counter++;
        }
        while (sum - twocoins >= 0) {
            sum -= twocoins;
            counter++;
        }
        while (sum - onecoin >= 0) {
            sum -= onecoin;
            counter++;
        }
    }
    cout << counter << endl;
    return 0;
}