while 1:
    default=str(input())
    aa=[]
    a=''
    if default:
        for i in default:
            aa.append(i)
        if aa[-1] !='0':
            if int(aa[-1]) < 5:
                aa[-1]='0'
            else:
                if len(aa)>1:
                    for i in range(0,len(aa)):
                        i+=1
                        if aa[-i] == '9':
                            aa[-i]='0'
                            if i ==len(aa):
                                a='1'
                                a=a+(''.join(aa))
                        else :
                            if aa[-i-1]!='9':
                                aa[-i-1]=str(int(aa[-i-1])+1)
                                aa[-i]='0'
                            break
                else:
                    aa='10'
        if a == '':
            a=a.join(aa)
        print(a)