#include <cstdio>
#include <iostream>
#include <cstring>
#include <algorithm>
int n;char s[110];
int main()
{
	scanf("%s",s+1);
	n=strlen(s+1);
	int l=1;bool flag=false;
	for(int i=n;i>=l;i--)
	{
		if(!flag&&s[i]=='0')
			continue;
		if(s[i]!='0')
			flag=true;
		if(s[l]!=s[i])
		{
			printf("No");
			return 0;
		}
		l++;
	}
	printf("Yes");
}
#include <algorithm>
#include <iostream>
using namespace std;

int main()
{
    int a[4];
    for(int i = 0; i < 4; i++) cin >> a[i];
    sort(a, a + 4);
    if(a[0] + a[3] == a[1] + a[2] || a[0] + a[1] + a[2] == a[3]) cout << "Yes" << endl;
    else cout << "No" << endl;
}
