View Compilation Error

0_0_13966551_20634.cpp: In function 'int main()':
0_0_13966551_20634.cpp:19:25: error: expected primary-expression before 'long'
         long long ans = long long(x-1) ;//数量变的话，总价是不会变的，所以要变到最终的x，至少也要变x-1次
                         ^