DMCA

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

inputFormat

Input

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

outputFormat

Output

Output the result – an integer number.

Examples

Input

1

Output

1

Input

81

Output

9

样例

1

1

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