a, b, c = input().split(' ')
a = int(a)
b = int(b)
c = int(c)
if a >= b and a >= c:
    if a < b + c:
        print('yes')
    else:
        print('no')
elif b >= a and b >= c:
    if b < a + c:
        print('yes')
    else:
        print('no')
elif c >= a and c >= b:
    if c < a + b:
        print('yes')
    else:
        print('no')

00e5dab19a8e7e202ec7adcba04776a922a4d312
<mask token>

<mask token>
if a >= b and a >= c:
    if a < b + c:
        print('yes')
    else:
        print('no')
elif b >= a and b >= c:
    if b < a + c:
        print('yes')
    else:
        print('no')
elif c >= a and c >= b:
    if c < a + b:
        print('yes')
    else:
        print('no')

a, b, c = input().split(' ')
a = int(a)
b = int(b)
c = int(c)
if a >= b and a >= c:
    if a < b + c:
        print('yes')
    else:
        print('no')
elif b >= a and b >= c:
    if b < a + c:
        print('yes')
    else:
        print('no')
elif c >= a and c >= b:
    if c < a + b:
        print('yes')
    else:
        print('no')
