def je_prestupny(rok):
    return rok % 4 == 0 and ((rok % 100 != 0) or (rok % 400 == 0))

def cislo_dne(d, m, r):
    mes = [0, 31, 28, 31, 30, 31, 30,   31, 31, 30, 31, 30, 31]
    for i in range(1,12):
        mes[i] += mes[i-1]
        
    if je_prestupny(r) and m > 2:
        d += 1

    return 365*(r-1) + (r-1)//4 - (r-1)//100 + (r-1)//400 + mes[m-1] + d
    return int(365.2425*(r-1)) + mes[m-1] + d 

def pocet_dnu(d1,m1,r1, d2,m2,r2):
    assert r1 > 0
    assert r2 > 0
    assert r2 >= r1
    return cislo_dne(d2,m2,r2) - cislo_dne(d1,m1,r1)