L,M,N = input(),input(),input()

NN = int(N)/25

if NN >= 1:
    M = M + NN
    N = N - NN*25
MM = int(M)/4

if MM >= 1:
    L = L + MM
    M = M - NN*4
LL = int(L)/4

if MM >= 1:
    L = L - LL*10

print L+M+N