A + B

input/code.cpp: In function 'int main()':
input/code.cpp:7:5: error: expected ',' or ';' before 'cout'
     cout << result ;
     ^~~~
input/code.cpp:6:10: warning: unused variable 'result' [-Wunused-variable]
     long result = (n*(n+1)*(n+2)/6)
          ^~~~~~

#include <iostream>
using namespace std;
int main() {
    int n;
    cin >> n;
    long result = (n*(n+1)*(n+2)/6) 
    cout << result ;
}