View Compilation Error

0_0_24747224_3672.cpp: In function 'bool calc(long long int)':
0_0_24747224_3672.cpp:23:9: error: 'maxn' was not declared in this scope
  if(n < maxn) {
         ^
0_0_24747224_3672.cpp:24:6: error: 'ispri' was not declared in this scope
   if(ispri[n])
      ^