from math import tan
from math import radians
angle = radians(float(input()))
print(f"{pow(tan(angle), -1):.10f}")
f8d1d8009cb41b733bf7d8de2798100e0048dad3
<mask token>

<mask token>
print(f'{pow(tan(angle), -1):.10f}')

<mask token>
angle = radians(float(input()))
print(f'{pow(tan(angle), -1):.10f}')

from math import tan
from math import radians
angle = radians(float(input()))
print(f'{pow(tan(angle), -1):.10f}')

from math import tan
from math import radians
angle = radians(float(input()))
print(f"{pow(tan(angle), -1):.10f}")