Tribonacci numbers are a sequence of numbers, defined as follows:

• t0 = t1 = 0,
• t2 = 1,
• ti = ti - 1 + ti - 2 + ti - 3.

You are given n; calculate n-th tribonacci number modulo 26.

Input

The only line of input contains an integer n (1 ≤ n ≤ 1000).

Output

Output n-th tribonacci number modulo 26.

见题面 Input 部分

见题面 Output 部分