View Compilation Error

0_0_18522283_31111.cpp: In function 'int main()':
0_0_18522283_31111.cpp:19:16: error: 'm' was not declared in this scope
  for(LL i=1;i<=m;i++){
                ^
0_0_18522283_31111.cpp:20:21: error: 'n' was not declared in this scope
   LL t=(LL)sqrt(i*i*n);
                     ^