# Write a function to calculate wind chill index.
import math


def wind_chill(v, t):
    windchill = (
        13.12 + 0.6215 * t - 11.37 * math.pow(v, 0.16) + 0.3965 * t * math.pow(v, 0.16)
    )
    return int(round(windchill, 0))
