# 输入字符串切割
s = input().split()
x = int(s[0])
y = int(s[1])
z = int(s[2])
# 平均分v
v = (x + y + z) / 3
# 判断是远途还是周边
if v >= 90:   #远途
    if x >= 90 and y >= 90 and z >= 90:
        print("beijing")
    elif (x >= 90 and y >= 90) or (x >= 90 and z >= 90) or (y >= 90 and z >= 90):
        print("xiamen")
    else:
        print("guilin")
elif 85 <= v < 90:   #周边
    if x>=85 and y>=85 and z>=85:
        print("shanghai")
    else:
        print("nanjing")
/**************************************************************
	Problem: 1679
	User: admin
	Language: Python
	Result: Accepted
	Time:277 ms
	Memory:34480 kb
****************************************************************/