/in/foo.c: In function 'main':
/in/foo.c:10:1: error: expected expression before '}' token
 }
 ^
/in/foo.c:4:18: warning: unused variable 'b' [-Wunused-variable]
  int n,sum=0,a=1,b=1,i;
                  ^
/in/foo.c:4:8: warning: unused variable 'sum' [-Wunused-variable]
  int n,sum=0,a=1,b=1,i;
        ^