s=input() st=[0]1000 top=-1 x=0 for i in range(len(s)): if "0"<=s[i]<="9": x=x10+int(s[i]) elif s[i]" ": top+=1 st[top]=x x=0 else: num1=st[top] top-=1 num2=st[top] top-=1 if s[i]"+": x=num2+num1 elif s[i]"-": x=num2-num1 elif s[i]"": x=num2num1 elif s[i]=="/": x=num2/num1 print("%.2lf"%x)