#include<iostream>
#include<string>
using namespace std;
int main()
{
int n,k,ans,t1;
cin>>n>>k;
ans=240-k;
for(int i=1;i<=n;i++)
{
ans-=(i*5);
if(ans<0)
{
t1=i-1;break;
}
}
if(ans>=0)
{cout<<n<<endl;}
else {cout<<t1<<endl;}
return 0;
}
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