View Compilation Error

0_0_24344995_1433.cpp: In function 'int f(int, int, long int)':
0_0_24344995_1433.cpp:11:24: error: too few arguments to function 'int f(int, int, long int)'
         return (a*f(n-1)+ b*f(n - 2)) %7;
                        ^
0_0_24344995_1433.cpp:4:5: note: declared here
 int f(int a,int b,long n)
     ^
0_0_24344995_1433.cpp:11:36: error: too few arguments to function 'int f(int, int, long int)'
         return (a*f(n-1)+ b*f(n - 2)) %7;
                                    ^
0_0_24344995_1433.cpp:4:5: note: declared here
 int f(int a,int b,long n)
     ^