{}
pyn,ec,bee,ms,cal,epcs,cs=map(float,input('enter pyn,ec,bee,ms,code,cs,epcs marks ::. . .').split())
su=[pyn,ec,bee,ms,cal,cs,epcs]
for i in range(7):
su[i]=su[i]/6
cgpa=(((su[4]+su[1])*4)+((su[0]+su[3]+su[2])*3)+su[5]+su[6])/19
print(round(cgpa,2))