View Compilation Error

0_0_15409388_7271.cpp: In function 'int main()':
0_0_15409388_7271.cpp:5:17: error: expected unqualified-id before ';' token
     int a,sum,n,;
                 ^
0_0_15409388_7271.cpp:11:8: error: 'i' was not declared in this scope
    for(i=1;i<=n;i++)
        ^