View Compilation Error

0_0_16579373_30103.cpp: In member function 'int solution::right_int(long int, long int)':
0_0_16579373_30103.cpp:16:67: error: no matching function for call to 'solution::right_int(int)'
     return ((right_int(n, m/2)%10)*(right_int(right_int(n, m/2)%10)*(n%10)) % 10;
                                                                   ^
0_0_16579373_30103.cpp:16:67: note: candidate is:
0_0_16579373_30103.cpp:10:7: note: int solution::right_int(long int, long int)
   int right_int(long int n, long int m) {
       ^
0_0_16579373_30103.cpp:10:7: note:   candidate expects 2 arguments, 1 provided
0_0_16579373_30103.cpp:16:81: error: expected ')' before ';' token
     return ((right_int(n, m/2)%10)*(right_int(right_int(n, m/2)%10)*(n%10)) % 10;
                                                                                 ^