/*
 * Program used in the experimental evaluation of the following paper.
 * 2010SAS - Alias,Darte,Feautrier,Gonnord, Multi-dimensional Rankings, Program Termination, and Complexity Bounds of Flowchart Programs
 *
 * Date: 2014
 * Author: Caterina Urban
 */

typedef enum {false, true} bool;

extern int __VERIFIER_nondet_int(void);

int main() {
    int i, x, n, b, t;
	i = __VERIFIER_nondet_int();
	x = __VERIFIER_nondet_int();
	n = __VERIFIER_nondet_int();
	b = __VERIFIER_nondet_int();
	if (b >= 1) {
		t = 1;
	} else {
		t = -1;
    }
	while (x <= n) {
		if (b >= 1) {
			x = x + t;
		} else {
			x = x - t;
		}
	}
	return 0;
}