C :

#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;
}

C++ :

#include<iostream>
using namespace std;
int main(){
    int a,b,c;
    cin>>a>>b>>c;
    if(a + b > c && b + c > a && a + c > b)    {
        cout<<"Yes"<<endl;
    }else{
        cout<<"No"<<endl;
    }
}
   

Python :

#!/usr/bin/python3
a,b,c=map(int,input().split())

if a+b>c and a+c>b and c+b>a:
    print("Yes")
else:
    print("No")