algorithms
코드포스 (codeforces)
코드포스 750A (codeforces 750A)
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Problem - 750A - Codeforces
코드
import java.io.*;
public class CF750A {
static int n, k, t, ans;
static String ins[];
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
ins = br.readLine().split(" ");
ans = n = Integer.parseInt(ins[0]);
k = Integer.parseInt(ins[1]);
for (int i = 0; i <= n; i++) {
t = 5 * ((i * (i + 1)) >> 1);
t = 240 - t;
if (t < k) {
ans = i - 1;break;
}
}
bw.write(ans + "\n");
bw.flush();bw.close();
}
}