// 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;
}

#define SIZE 10000001
#define UPPER 2150000000U
#define LOWER 2146000000U
char a[UPPER-LOWER+10];

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

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