View Compilation Error

0_0_22487451_17165.cpp: In function 'int main()':
0_0_22487451_17165.cpp:4:12: error: redeclaration of 'int n'
  int m,n,a,n,i,j;
            ^
0_0_22487451_17165.cpp:4:8: note: 'int n' previously declared here
  int m,n,a,n,i,j;
        ^