#include<stdio.h>
int main(){
	int a,b,c;
	scanf("%d%d%d",&a,&b,&c);
	if(a+b>c&&a-b<c&&a+c>b&&a-c<b&&b+c>a&&b-c<a){
		printf("Yes");
	}else{
		printf("No");
	}
	return 0;
}
/**************************************************************
	Problem: 1045
	User: admin
	Language: C
	Result: Accepted
	Time:12 ms
	Memory:1144 kb
****************************************************************/