#!/bin/bash
gcd() {
    local a=$1 b=$2
    while [ $b -ne 0 ]; do
        local temp=$b
        b=$((a % b))
        a=$temp
    done
    echo $a
}
if [ $# -ne 2 ]; then
    echo "Usage: $0 <num1> <num2>"; exit 1
fi
echo "НОД($1, $2) = $(gcd $1 $2)"