# ch52.py  20081103  jim@well.com 

def is_tri(a,b,c): 
    print "in is_tri", a, b, c 
    x = a + b + c 
    print "x is ", x 
    if (2*a > x): 
        print "no", a, x  
    elif (2*b > x): 
        print "no", b, x  
    elif (2*c > x): 
        print "no", c, x  
    else: 
        print "yes" 

prompt = "Enter a number: " 
a = int(raw_input(prompt)) 
b = int(raw_input(prompt)) 
c = int(raw_input(prompt)) 

is_tri(a,b,c) 

print "bye"