#include <iostream>

int main() {
    int sum = 0;
    for (int i = 0; i < 10; i++) {
        for (int j = 0; j < 10; j++) {
            sum += (i * 10) + j;
        }
    }
    std::cout << "Tong tu 1 den 100 la: " << sum << std::endl;
    return 0;
}