extern void abort(void);

extern void __assert_fail (const char *__assertion, const char *__file,
      unsigned int __line, const char *__function)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
extern void __assert_perror_fail (int __errnum, const char *__file,
      unsigned int __line, const char *__function)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
extern void __assert (const char *__assertion, const char *__file, int __line)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));

void reach_error() { ((void) sizeof ((0) ? 1 : 0), __extension__ ({ if (0) ; else __assert_fail ("0", "assert.h", 3, __extension__ __PRETTY_FUNCTION__); })); }
extern void abort(void);
void assume_abort_if_not(int cond) {
  if(!cond) {abort();}
}
void __VERIFIER_assert(int cond) {
  if (!(cond)) {
      ERROR: {reach_error();abort();}
  }
  return;
}
int __VERIFIER_nondet_int();
int main() {
    unsigned int i,j,a,b;
    int flag = __VERIFIER_nondet_int();
    a = 0;
    b = 0;
    j = 1;
    if (flag) {
        i = 0;
    } else {
        i = 1;
    }
    while (__VERIFIER_nondet_int()) {
        a++;
        b += (j - i);
        i += 2;
        if (i%2 == 0) {
            j += 2;
        } else {
            j++;
        }
    }
    if (flag) {
        __VERIFIER_assert(a == b);
    }
    return 0;
}