L = int(input())
M = int(input())
N = int(input())
if N >= 25:
    Nm = N // 25 #1円硬貨を25円硬貨に両替
else:
    Nm = 0
N = N % 25 #余りの1円硬貨
if ( M + Nm ) >= 4:
    Ml = ( M + Nm ) // 4
else:
    Ml = 0
M = (M + Nm ) % 4
L = L + Ml

print ( N + M )