#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int t,c=0;
cin>>t;
while(t--)
{
int x;
long long y=0;
cin>>x;
for(int i=1;i<x;i++)
{
if(y==x-1)
break;
y+=i;
c++;
}
}
cout<<c;
return 0;
}
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