View Compilation Error

0_0_38815234_7588.cpp: In function 'void Solve()':
0_0_38815234_7588.cpp:18:22: error: 'Check' was not declared in this scope
   18 |   cout << year + 7 - Check(year + (year % 4 == 0 ? 0 : 4 - year % 4)) << '\n';
      |                      ^~~~~