View Compilation Error

0_0_38233602_14950.cpp: In function 'int main()':
0_0_38233602_14950.cpp:13:16: error: 'I' was not declared in this scope
   for(i=0;i<=n;I++)
                ^
0_0_38233602_14950.cpp:16:3: error: expected ';' before '}' token
   }
   ^
0_0_38233602_14950.cpp:24:14: error: 'sum' was not declared in this scope
  printf("%d",sum);
              ^