範例程式碼 uva12869

//uva12869
#include <iostream>
using namespace std;

int main() {
    long long int low, high, low_zeros, high_zeros;
    while (cin >> low >> high) {
        if (low == 0 && high == 0)
            break;
        low_zeros = 0;
        high_zeros = 0;
        low_zeros = low_zeros + (low / 5);
        high_zeros = high_zeros + (high / 5);
        cout << high_zeros - low_zeros + 1 << endl;
    }
    return 0;
}