#include <stdio.h>

int main() {
    int x, y;
    scanf("%d", &x);
    if (x > 0) {
        y = x + 1;
    } else if (x == 0) {
        y = 0;
    } else {
        y = x - 1;
    }
    printf("%d\n", y);
    return 0;
}
/**************************************************************
	Problem: 1038
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:1144 kb
****************************************************************/