L = int(input())
M = int(input())
N = int(input())
Nm = N // 25 #1円硬貨を25円硬貨に両替
N = N % 25 #余りの1円硬貨
Ml = (M + Nm ) // 4
M = (M + Nm ) % 4
L = L + Ml

print ( N + M )