View Compilation Error

0_0_35897345_7160.cpp: In function 'long long int qsm(long long int, long long int, long long int)':
0_0_35897345_7160.cpp:54:22: error: too few arguments to function 'long long int mul(long long int, long long int, long long int)'
             mul(ans,a);
                      ^
0_0_35897345_7160.cpp:6:11: note: declared here
 long long mul(long long a,long long b,long long P){
           ^
0_0_35897345_7160.cpp:58:16: error: too few arguments to function 'long long int mul(long long int, long long int, long long int)'
         mul(a,a);
                ^
0_0_35897345_7160.cpp:6:11: note: declared here
 long long mul(long long a,long long b,long long P){
           ^