def correl (list1,list2):
    '''Расчет коэффициента корреляции'''
    n = min(len(list1),len(list2))
    list1 = list1[:n]
    list2 = list2[:n]
    mean1 = sum(list1)/n
    mean2 = sum(list2)/n
    chis = sum((list1[i]-mean1)*(list2[i]-mean2)for i in range(n))
    znam1 = sum((x-mean1)**2 for x in list1)
    znam2 = sum((y-mean2)**2 for y in list1)
    
    if znam1 == 0 or znam2 == 0:
        return 0

    return chis/(znam1*znam2)**0.5