N= int(raw_input())
#match = [6, 2, 4, 5, 4, 5, 6, 3, 7, 6]

ans = ""
if N%2 == 0:
    ans += "1" * (N/2) 
else:
    ans += "7"
    ans += "1" * (N/2 -1)
    
print int(ans)