#include <stdio.h>

int main(void) {
    // a+b = xor(a,b) iff a&b == 0
    long n, res;
    scanf("%li", &n);
    if (!n) {
        puts("1");
    } else if ((n & (n-1)) == 0) {
        printf("%li\n", n);
    } else {
        __asm__ volatile ("popcnt %%rcx, %%rax" :: "c"(n));
        __asm__ volatile ("bsr %rcx, %rcx\n"
                          "inc %rcx\n"
                          "subq %rax, %rcx\n"
                          "movq $1, %r8\n"
                          "shlq %cl, %r8\n");
        __asm__ volatile ("movq %%r8, %0" : "=r"(res));
        printf("%li\n", res);
    }
    return 0;
}