/in/foo.cc: In function 'int main()':
/in/foo.cc:27:22: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
     scanf("%I64d", &n);
                      ^
/in/foo.cc:29:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
     printf("%I64d\n", work(n));
                              ^