def f( m , r , n )
	a = m * pow( ( 1 + r ) , n )
	return a
end

def pow( x , y )
	a = 1;
	y.times { |i|
		a = a * x
	}
	return a
end

printf( " 金額? >" )
m = gets.to_i

printf( " 利率? >" )
r = gets.to_f
n = 1
(2..10).each { |p|
	while true do
		if f( m , r , n ) > ( m * p ) then
			break
		else	
			n += 1
		end
	end
	printf( "%d円を利率%3.2fで預けた時,元利合計は%d年後に%d円以上となります\n" , m , r , n , m*p )
}