Repeat asteriks

#include <iostream>

int main() {
    int num = 0;
    std::cout << "How many asterisk?" << std::endl;
    std::cin >> num ;
    while(num > 30){
        std::cout << "Pleas enter a number less than 30"<< std::endl;
        std::cin >> num;
    }


for (int i = 1  ; i <= num && i <= 30; i++) {

        for(int m = 1; m <= i; m++)
        {
            std::cout << "*";
        }
         std::cout << "\n";
    }

    return 0;
}