extern void abort(void);
extern void __assert_fail(const char *, const char *, unsigned int, const char *) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
void reach_error() { __assert_fail("0", "eq1.c", 3, "reach_error"); }
extern unsigned int __VERIFIER_nondet_uint(void);
void __VERIFIER_assert(int cond) {
  if (!(cond)) {
    ERROR: {reach_error();abort();}
  }
  return;
}
int main(void) {
  unsigned int w = __VERIFIER_nondet_uint();
  unsigned int x = w;
  unsigned int y = __VERIFIER_nondet_uint();
  unsigned int z = y;
  while (__VERIFIER_nondet_uint()) {
    if (__VERIFIER_nondet_uint()) {
      ++w; ++x;
    } else {
      --y; --z;
    }
  }
  __VERIFIER_assert(w == x && y == z);
  return 0;
}