Description

In the year of 2014, a well-known song has born...... and the name is "My Skate Shoes"(我的滑板鞋). 

The song is known for its brainwashing style. The singer, Joseeh Pummanlon(約瑟翰 ‧ 龐麥郎), just slides left, then slide right... then slide everywhere with his skate shoes, like the step of devil, like the step of devil.

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Now Pummanlon is at the position 0. He has a sequence of commands which tells him to slide left or to slide right. 'L' is to slide left, 'R' is to slide right.

For example, "LRLR" means he will slide to position -1, then 0, then -1, and stop at position 0.

However, Pummanlon wants to free his sliding style at today's show. He still receives the sliding commands, but he might not perform some of the commands.

For example, if Pummanlon receives the commands "LRLR", then here are some possible outcomes:

• "LRLR": Pummanlon moves to the left, to the right, then to the left again and end up at position -1.
• "LRLR": Pummanlon moves to the left, to the right, then to the left and to the right again and end up at position 0.
• "LRLR": Pummanlon doesn't move, he stands at position 0 like a blockhead instead of devil.
• "LRLR": Pummanlon moves to the left, to the right, then to the right again and end up at position 1.

Pummanlon doesn't know which command will be performed since he will not know the mood while he's performing.Thus, he wants to know how many different positions may Pummanlon stops at.

Input

The first line contains an integer N, indicates the number of commands.

The second line cocntains a string, contains exactly N commands of 'L' and 'R'.

1 <= N <= 10⁵

Output

Print one integer — the number of different positions Pummanlon may end up at.

Remember to print a '\n' at the end of the integer.

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Take sample as example, Pummanlon may end up anywhere between -2 and 2:

• LL -> -2
• LLR -> -1
• LR -> 0
• R -> 1
• RR -> 2

Sample Input  Download

Sample Output  Download

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