// yukicoder: No. 702 中央値を求めよ LIMITED
// 2019.5.5 bal4u

#include <stdio.h>

unsigned x = 0, y = 1, z = 2, w = 3;
unsigned generate() { 
    unsigned t = x^(x<<11);
    x = y, y = z, z = w;
    w = (w ^ (w >> 19)) ^ (t ^ (t >> 8));
    return w;
}

unsigned selection(unsigned *a, int sz, int n) {
	int i, j, l, r;
	unsigned p, t;
	l = 0, r = sz-1;
	while (l < r) {
		p = a[(l+r)/2];
		i = l-1, j = r+1;
		while (1) {
			while (a[++i] < p);
			while (a[--j] > p);
			if (i > j) break;
			t = a[i], a[i] = a[j], a[j] = t;
		}
		if (n < i) r = j;
		if (n > j) l = i;
	}
	return a[n];
}

#define SIZE 10000001
#define UPPER (unsigned)2150000000
#define LOWER (unsigned)2146000000
unsigned a[UPPER-LOWER+10000]; int sz;

int main()
 {
    int i, cnt;
	unsigned k;

	scanf("%u", &x); 
	sz = 0, cnt = 0;
	i = SIZE; while (i--) {
		k = generate();
		if (k <= LOWER) cnt++;
		else if (k < UPPER) a[sz++] = k;
	}
	printf("%u\n", selection(a, sz, (SIZE >> 1)-cnt));
    return 0;
}