Problem: Many people are aware of DMCA – Digital Millennium Copyright Act. But another recently proposed DMCA – Digital Millennium Calculation Act – is much less known.

In this problem you need to find a root of a number according to this new DMCA law.

Input

The input contains a single integer a (1 ≤ a ≤ 1000000).

Output

Output the result – an integer number.

Examples

Input


1


Output


1


Input


81


Output


9

Solution (in PYTHON3):

Solution:
def maissa(myinput):
    aa=str(myinput)
    while(len(aa)!=1):
        result=0
        for i in range(len(aa)):
            result=result+int(aa[i])
        aa=str(result)
    return(int(aa))

t=int(input())
print(maissa(t))