>>319
#include <iostream>
#include <algorithm>
#include <string>

using namespace std;

int main(void){
int a[3], chk;
string s1, s2;

cin >> a[0] >> a[1] >> a[2];
sort(&a[0], &a[2+1]);

if(a[0]<=0 || a[2]>=a[0]+a[1]){
cout << "三角形として不可能な３辺の長さです" << endl;
return 0;
}

chk=a[2]*a[2]-(a[0]*a[0]+a[1]*a[1]);
if(chk==0) s1="直角";
else if(chk<0) s1="鋭角";
else s1="鈍角";

if(a[0]==a[2]) s2="正", s1="";
else if(a[0]==a[1] || a[1]==a[2]) s2="二等辺";
else s2="不等辺";

cout << s1 << s2 << "三角形" << endl;

return 0;
}