Challenges

Floating Number
Bob has a floating point number N. He wants to set the precision for 2...
Max. Marks: 4
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SwapMaster solves Symmetric Swap
The SwapMaster is known to be the greatest and fastest swapper of all ...
Max. Marks: 4
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String Matching
Cody has a sequence of characters N. He likes a sequence if it contain...
Max. Marks: 3
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Leap Year
Steve is playing a quiz game with his brother John. As Steve just lear...
Max. Marks: 6
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Project Teams
There are N students in a class and Teacher want to divide these stude...
Max. Marks: 5
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Circle of Numbers
All numbers in NumberLand are standing in a circle for a dancing cerem...
Max. Marks: 6
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Happy String
A happy string is a string in which each character is lexicographicall...
Max. Marks: 4
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Degree Celsius
Tom is a scientist. He uses huge machines for complex calculations. Th...
Max. Marks: 4
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Three's Company
This problem requires you to create a output string from input string ...
Max. Marks: 4
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Array Sum
You are given an integer array and you have to find the sum of the ele...
Max. Marks: 4
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Project Teams
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Problem Statement
There are N students in a class and Teacher want to divide these students into some groups . Teacher told  that groups consisting of two or less students not allowed , so Teacher want to have as many groups consisting of three or more students as possible. Divide the students so that the number of groups consisting of three or more students is maximized.

Input
Single integer N

Output
Maximum number of groups can be formed

Constraints
1<=N<100000

Sample Input
6

Sample Output

2

Dcoded By: Rajat Gupta

Solved By: 2978

Maximum Marks: 5