Sgu-105-div 3 (simple math problem!) )

Source: Internet
Author: User

SGU-105Div 3
Time Limit: 250MS Memory Limit: 4096KB 64bit IO Format: %i64d &%i64u

Submit Status


There is sequence 1, 12, 123, 1234, ..., 12345678910, ..... Given first N elements of that sequence. You must determine amount of numbers in it is divisible by 3.


Input contains N (1<=n<=231-1).


Write answer to the output.

Sample Input


Sample Output



Math problem! Find the Rules!

Rule: 0,1,1,0,1,1,0,1,1,0,1,1 .... (0 means not divisible by 3, 1 means divisible by 3!) )

AC Code:

Sgu-105-div 3 (simple math problem!) )

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