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10497.cpp
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10497.cpp
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#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
typedef unsigned int uint;
typedef long long int64;
typedef unsigned long long uint64;
using namespace std;
int main(){
while(true){
int n;
cin>>n;
if(n == -1)
break;
if(n == 3){
cout<<"2\n";
continue;
}
cout<<(n-1)*(n-1)<<endl;
}
return 0;
}