View Compilation Error

0_0_33341932_17644.cpp: In function 'int main()':
0_0_33341932_17644.cpp:17:9: error: conflicting declaration 'int a'
     int a,n;
         ^
0_0_33341932_17644.cpp:16:16: note: previous declaration as '__int128 a'
     __int128_t a;
                ^