a,b=map(int,input().split())
n=int(a**0.5)
print("Vladik" if n*(n+1)<=b else "Valera") #include<bits/stdc++.h>
using namespace std;
#define int long long
void solve() {
int a,b;cin>>a>>b;
for(int i=1;;++i){
if(i%2==1)a-=i;
else b-=i;
if(b<0){cout<<"Valera";return;}
if(a<0){cout<<"Vladik";return;}
}
}
signed main(){
ios::sync_with_stdio(false),cin.tie(nullptr);
int t=1;
while(t--)solve();
return 0;
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