View Compilation Error

0_0_37269250_19646.cpp: In function 'int main()':
0_0_37269250_19646.cpp:5:22: error: unable to find numeric literal operator 'operator""n'
 printf("%d\n",(n*n*n+5n)/6+1);
                      ^
0_0_37269250_19646.cpp:5:22: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes