lsm = []
for i in range(3):
    lsm.append(int(input()))
if 0<=lsm[0]<=1000 and 0<=lsm[1]<=1000 and 0<=lsm[2]<=1000:
    N_ex = lsm[2]//25
    if N_ex>0:
        lsm[1]+=N_ex
        lsm[2]-=N_ex*25
    M_ex = lsm[1]//4
    if M_ex>0:
        lsm[0]+=M_ex
        lsm[1]-=M_ex*4
    L_ex = lsm[0]//10
    if L_ex>0:
        lsm[0]-=L_ex*10
    print(lsm[0]+lsm[1]+lsm[2])
else:
    print('error')