foo.c:1:1: warning: data definition has no type or storage class
    1 | sand = int(input())   # 沙子的总吨数
      | ^~~~
foo.c:1:1: warning: type defaults to 'int' in declaration of 'sand' [-Wimplicit-int]
foo.c:1:8: error: expected expression before 'int'
    1 | sand = int(input())   # 沙子的总吨数
      |        ^~~
foo.c:1:23: error: stray '#' in program
    1 | sand = int(input())   # 沙子的总吨数
      |                       ^
foo.c:2:23: error: stray '#' in program
    2 | times = int(input())  # 大卡车运输的次数
      |                       ^
foo.c:4:33: error: stray '#' in program
    4 | remain_sand = sand - times * 5  # 剩余的沙子数量
      |                                 ^

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