l100=int(input())
m25=int(input())
n1=int(input())
o1000=0

while n1 >= 25:
    n1-=25
    m25+=1
#print(o1000,l100,m25,n1,'step1')
while m25 >= 4:
    m25-=4
    l100+=1
#print(o1000,l100,m25,n1,'step2')
while l100 >= 10:
    l100-=10
    o1000+=1
#print(o1000,l100,m25,n1,'step3')
print(o1000+l100+m25+n1)
#print(o1000,l100,m25,n1)