foo.c:3:1: warning: data definition has no type or storage class
    3 | H=int(input())
      | ^
foo.c:3:1: warning: type defaults to 'int' in declaration of 'H' [-Wimplicit-int]
foo.c:3:3: error: expected expression before 'int'
    3 | H=int(input())
      |   ^~~

[Hydro](https://hydro.ac)提供评测服务