/in/foo.c:1:1: warning: data definition has no type or storage class
 L1=int(input())
 ^~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'L1' [-Wimplicit-int]
/in/foo.c:1:4: error: expected expression before 'int'
 L1=int(input())
    ^~~