View Compilation Error

0_0_30535350_26472.cpp: In function 'int main()':
0_0_30535350_26472.cpp:15:30: error: 'n' was not declared in this scope
         for(int i = 1 ; i <= n ; i++){
                              ^
0_0_30535350_26472.cpp:20:30: error: 'n' was not declared in this scope
         for(int i = 2 ; i <= n ; i++){
                              ^
0_0_30535350_26472.cpp:23:30: error: 'n' was not declared in this scope
         for(int i = 1 ; i <= n ; i++){
                              ^