n, m, k = input().split()
n = int(n)
m = int(m)
k = int(k)

chisla = [n, m, k]

maxOfAll = max(chisla)
minOfAll = min(chisla)

maxandmin = [maxOfAll, minOfAll]
srednee = 0



for a in range(3):
    if chisla[a] not in maxandmin:
        srednee = chisla[a]

if srednee == 0:
    srednee = minOfAll



dovolnie = minOfAll
if minOfAll == 0:
    minOfAll = srednee
else:
    dovolnieList = [maxOfAll - minOfAll, srednee]
    dovolnie = dovolnie + min(dovolnieList)

print(dovolnie)