#include <iostream>

int main()
{
    int valor = 0,
        mayor;
    
    std::cout << "Entre un valor entero : ";
    std::cin >> valor;
    mayor = valor;
    
    while (valor >= 0)
    {
        std::cout << "Entre un valor entero : ";
        std::cin >> valor;
        if (valor > mayor)
        {
            mayor = valor;
        }
    }
    std::cout << "valor mayor = " << mayor << std::endl;

    return 0;
}