If you are new to learning programming and do not know where to start, please try Problem A “Welcome to AtCoder” from practice contest. There you can find a sample code for each language.

In this problem, the sweets are indistinguishable, so we only have to consider how many sweets A and B receive. There are \(N-1\) possible numbers of sweets that A may receive, spanning from \(1\) through \(N-1\) (inclusive). This holds even if \(N=1\). Therefore, you can receive an integer from the standard input, and then output the value subtracted by one.

Sample Code (Python)

N = int(input())
print(N-1)

Sample Code (C++)

#include <iostream>
using namespace std;

int main(){
	int N;
	cin >> N;
	cout << N-1;
}

Sample Code (C)

#include<stdio.h>

int main(){
	int N;
	scanf("%d", &N);
	printf("%d", N-1);
}