Compilare: user.cpp: In function ‘int main()’: user.cpp:37:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( long long i = input-15; i<=input*5; i += 5) ^ user.cpp:27:28: warning: unused variable ‘start’ [-Wunused-variable] unsigned long long n = 0, start = 0, end = firstN; ^ user.cpp:27:39: warning: unused variable ‘end’ [-Wunused-variable] unsigned long long n = 0, start = 0, end = firstN; ^