#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

long long int countArray(long long int n,long long int k,long long int x) {
    // Return the number of ways to fill in the array.
    long long int ans;
    ans=(2*k)-3;
    return ans;
}

int main() {
    long long int n; 
    long long int k; 
    long long int x; 
    scanf("%lld %lld %lld", &n, &k, &x);
    long long int answer = countArray(n, k, x);
    printf("%lld\n", answer);
    return 0;
}