typedef enum {false,true} bool; extern int __VERIFIER_nondet_int(void); int main() { int x; int y; int z; x = __VERIFIER_nondet_int(); y = __VERIFIER_nondet_int(); z = __VERIFIER_nondet_int(); while (x > z) { while (y > z) { y = y-1; } x = x-1; } return 0; }