Count Before Minus One

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

Read integers until the first occurrence of exactly -1. Count all preceding integers. Other negative values and zero are ordinary data.

Input

A sequence of integers ending at its first -1.

Output

Print the number of integers before -1.

Subtasks

• Subtask 1 (20%): At most 5 values in [-10,10] excluding -1.
• Subtask 2 (30%): At most 200 values in [-10000,10000] excluding -1.
• Subtask 3 (50%): At most 100000 values in [-1000000,1000000] excluding -1.

Examples

Example 1

Input

5 0 7 -1

Output

3

Explanation

Five, zero and seven are three values; -1 does not count.

Example 2

Input

-2 -3 -1

Output

2

Explanation

Both -2 and -3 are data because only -1 terminates input.