# Arup Guha
# 8/11/2025
# Solution to 2025 UCF Locals Final Round Problem: Duck Stress Balls

# Get num ducks.
nC = int(input())

# Read and sort frequencies.
vals = []
for i in range(nC):
    vals.append(int(input()))
vals.sort(reverse=True)

# Here is the criteria.
if 3*vals[0] > sum(vals):
    print("NO")
else:
    print("YES")