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

m = 10000
r = 0.05
n = 2
printf( "%d円を利率%3.2fで%d年間預けた時の元利合計は%d円です\n" , m , r , n , f( m , r , n ) )