import java.util.InputMismatchException;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int a, b, c;
try {
a = sc.nextInt();
b = sc.nextInt();
c = sc.nextInt();
if(a > 0 && b > 0 && c > 0 && a + b > c && b + c > a && c + a > b)
System.out.println("Yes");
else
System.out.println("No");
} catch(InputMismatchException e) {
System.out.println("Input type mismatch error!");
}
sc.close();
}
}
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