int max_of_four(int a, int b, int c, int d){
    int list[] {a,b,c,d};
    int tam = sizeof(list)/ sizeof(int);
    int temp;
    for (int i = 0; i <= tam; i++) {
        if(list[i] > temp){ 
            temp = list[i];
            };
    }
    return temp;
}