View Compilation Error

0_0_25396978_6188.cpp: In function 'int main()':
0_0_25396978_6188.cpp:67:19: error: redeclaration of 'long long int top'
         long long top=n/2;
                   ^
0_0_25396978_6188.cpp:65:19: note: 'long long int top' previously declared here
         long long top=n/2;
                   ^