View Compilation Error

0_0_17805721_15070.cpp: In function 'long long int china(long long int, long long int, long long int, long long int)':
0_0_17805721_15070.cpp:80:8: error: 'ans' was not declared in this scope
     if(ans < 0)
        ^
0_0_17805721_15070.cpp:85:13: error: 'ans' was not declared in this scope
     return (ans + lcm) % (lcm);
             ^