November 30

In this problem, a date is written as Y-M-D. For example, 2019-11-30 means November 30, 2019.

Integers M_1, D_1, M_2, and D_2 will be given as input. It is known that the date 2019-M_2-D_2 follows 2019-M_1-D_1. Determine whether the date 2019-M_1-D_1 is the last day of a month.

Constraints

• Both 2019-M_1-D_1 and 2019-M_2-D_2 are valid dates in the Gregorian calendar.
• The date 2019-M_2-D_2 follows 2019-M_1-D_1.

Input

Input is given from Standard Input in the following format:

M_1 D_1 M_2 D_2

Output

If the date 2019-M_1-D_1 is the last day of a month, print 1; otherwise, print 0.

Examples

Input

11 16 11 17

Output

0

Input

11 30 12 1

Output

1

inputFormat

input. It is known that the date 2019-M_2-D_2 follows 2019-M_1-D_1. Determine whether the date 2019-M_1-D_1 is the last day of a month.

Constraints

• Both 2019-M_1-D_1 and 2019-M_2-D_2 are valid dates in the Gregorian calendar.
• The date 2019-M_2-D_2 follows 2019-M_1-D_1.

Input

Input is given from Standard Input in the following format:

M_1 D_1 M_2 D_2

outputFormat

Output

If the date 2019-M_1-D_1 is the last day of a month, print 1; otherwise, print 0.

Examples

Input

11 16 11 17

Output

0

Input

11 30 12 1

Output

1

样例

11 16
11 17

0