/in/foo.c:1:1: warning: data definition has no type or storage class
 a,m,k= map(float,input().split())
 ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
/in/foo.c:1:3: warning: type defaults to 'int' in declaration of 'm' [-Wimplicit-int]
 a,m,k= map(float,input().split())
   ^
/in/foo.c:1:5: warning: type defaults to 'int' in declaration of 'k' [-Wimplicit-int]
 a,m,k= map(float,input().split())
     ^
/in/foo.c:1:8: warning: implicit declaration of function 'map' [-Wimplicit-function-declaration]
 a,m,k= map(float,input().split())
        ^~~
/in/foo.c:1:12: error: expected expression before 'float'
 a,m,k= map(float,input().split())
            ^~~~~
/in/foo.c:2:1: error: expected ',' or ';' before 'qian'
 qian = k*( a/20 - m)
 ^~~~
/in/foo.c:3:18: warning: multi-character character constant [-Wmultichar]
 if qian<=0:print('%.2f'%(0))
                  ^~~~~~
/in/foo.c:4:12: warning: multi-character character constant [-Wmultichar]
 else:print('%.2f'%(qian))
            ^~~~~~