import math

f1 = open('input.txt')
f2 = open('output.txt', 'w')

s = f1.readline()
str = str()
i = 0

while (i < len(s)):
    if (s[i] == 's' and s[i + 1] == 'i'):
        i += 3
        str += 'math.sin'
    elif (s[i] == 's' and s[i + 1] == 'q'):
        i += 4
        str += 'math.sqrt'
    elif (s[i] == 'c'):
        i += 3
        str += 'math.cos'
    else:
        str += s[i]
        i += 1

ans = eval(str)

f2.write('%.3f' % (ans))