'''
@Author: your name
@Date: 2020-07-08 10:53:48
@LastEditTime: 2020-07-08 11:42:41
@LastEditors: Please set LastEditors
@Description: In User Settings Edit
@FilePath: \vscode_py\day4.py
'''
# Question 14:
# 统计大写字母和小写字母的数量
def Q14():
    low=0
    up=0
    str_l=input()
    for i in str_l:
        if i.islower():
            low+=1

        elif i.isupper():
            up+=1
        else:
            continue
    print("UPPER CASE :{}\nUPPER CASE :{}".format(up,low))


# Question15:
# 输入一个数字 a，计算 a+aa+aaa+aaaa 
def Q15():
    sum=0
    tmp=str()   
    a=input()           # a是一个str类型
    # print(a)
    for i in range(4):
        tmp+=str(a)
        sum+=int(tmp)
    print(sum)



if __name__ == "__main__":
    # Q14()

    Q15()