View Compilation Error

0_0_6586504_28577.cpp: In function `long long int lucas(long long int, long long int, long long int)':
0_0_6586504_28577.cpp:298: error: `k' undeclared (first use this function)
0_0_6586504_28577.cpp:298: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6586504_28577.cpp:300: error: expected primary-expression before '}' token
0_0_6586504_28577.cpp:300: error: expected `;' before '}' token