View Compilation Error

0_0_26398877_11134.cpp: In function 'int main(int, const char**)':
0_0_26398877_11134.cpp:24:20: error: too few arguments to function 'long long int f(long long int, long long int)'
         cout << f(n) << endl;
                    ^
0_0_26398877_11134.cpp:4:11: note: declared here
 long long f(long long n, long long m)
           ^