extern int __VERIFIER_nondet_int(void);

int foo(int x,int tx,int y,int ty,int n){
if (x + y >= 0) {
		while (x <= n && x >= 2 * tx + y && y >= ty + 1 && x >= tx + 1) {
			if (__VERIFIER_nondet_int() != 0) {
				tx = x;
				ty = y;
				x = __VERIFIER_nondet_int();
				y = __VERIFIER_nondet_int();
			} else {
				tx = x;
				x = __VERIFIER_nondet_int();
			}
		}
	}
return 0;
}