View Compilation Error

0_0_39829475_24146.cpp: In function 'int main()':
0_0_39829475_24146.cpp:9:19: error: expected ';' before 'cin'
    9 |     sum1=n*(n+1)/2
      |                   ^
      |                   ;
   10 |     cin>>n;
      |     ~~~