#include<stdio.h>
main() {
	int x,y,z;
	scanf("%d %d %d %d",&x,&y,&z);
	double a = (x + y + z) / 3.0;
	if(a >= 90) {
		int n = 0;  //统计在90分以上的科目数量
		if(x >= 90) {
			n++;
		}
		if(y >= 90) {
			n++;
		}
		if(z >= 90) {
			n++;
		}
		if(n == 3) {
			printf("beijing");
		} else if(n == 2) {
			printf("xiamen");
		} else {
			printf("guilin");
		}
	} else if(a >= 85) {
		if(x >= 85 && y >= 85 && z >= 85) {
			printf("shanghai");
		}  else {
			printf("nanjing");
		}
	}
}

/**************************************************************
	Problem: 1679
	User: admin
	Language: C
	Result: Accepted
	Time:47 ms
	Memory:1144 kb
****************************************************************/