# Lesson 4. September 24 - 30. Loops: while statement

# Automated Telephone Exchange

In St Petersburg phone numbers are formatted as "**XXX-XX-XX**", where the first three digits represent index of the Automated Telephone Exchange (ATE). Each ATE has exactly **10000** unique phone numbers.

Peter has just bought a new flat and now he wants to install a telephone line. He thinks that a phone number is lucky if the arithmetic expression represented by that phone number is equal to zero. For example, the phone number **102-40-62** is lucky (**102 - 40 - 62 = 0**), and the number **157-10-47** is not lucky (**157 - 10 - 47** = **100** ≠ **0**).

Peter knows the index of the ATE that serves his house. To get an idea of his chances to get a lucky number he wants to know how many lucky numbers his ATE has.

#### Input

Contains a single integer number **n** - the index of Peter's ATE (**100** ≤ **n** ≤ **999**).

#### Output

Output a single integer number - the number of lucky phone numbers Peter's ATE has.

196

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