N=int(input())
a=[0,0,0,0]
b=[0,0,0,0]
summ=-1

for i in range(4):
    a[i]=int(input())

for t in range(N//4-1):
    for i in range(4):
        b[i]=int(input())
    for i in range(4):
        for j in range(i,4):
            if summ==-1:
                summ=a[i]+b[j]
            if a[i]+b[j]<summ:
                summ=a[i]+b[j]
    for i in range(4):
        if a[i]>b[i]:
            a[i]=b[i]

for i in range(N%4):
    b[i]=int(input())
for i in range(N%4):
    for j in range(i,N%4):
        if summ==-1:
            summ=a[i]+b[j]
        if a[i]+b[j]<summ:
            summ=a[i]+b[j]

print(summ)