t=[18,15,12,10,8,6,4,2,1]
l=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
for i in range(0,20):
    l[0]=l[0]+25
    for j in range(0,9):
        l[1+((i+j)%19)]=l[1+((i+j)%19)]+t[j]
    print(l)
    #print(sorted(l,reverse=True))
    if l[0] > max(l[1:20])+(25*(20-i)):
        print(i+1)
        break