Submission #486493

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define rep(i,x,y) for(int i=(x);i<(y);++i)
#define mp(a,b) make_pair((a),(b))
#define debug(x) #x << "=" << (x)
 
#ifdef DEBUG
#define _GLIBCXX_DEBUG
#define dump(x) std::cerr << debug(x) << " (L:" << __LINE__ << ")" << std::endl
#else
#define dump(x)
#endif

typedef long long int ll;
typedef pair<int,int> pii;
//template<typename T> using vec=std::vector<T>;

const int INF=1<<30;
const long long int INFLL=1LL<<58;
const double EPS=1e-9;
const int dx[]={1,0,-1,0},dy[]={0,1,0,-1};

template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec){
	os << "[";
	for (const auto &v : vec) {
		os << v << ",";
	}
	os << "]";
	return os;
}

void Solve(){
    const ll mod=1000000007LL;
    ll l;
    cin >> l;
    if(l<7){
        cout << 0 << endl;
        return;
    }
    
    __int128 t=l-7;
    __int128 ans=t*t+4;
    ans/=8;
    ans%=mod;
    ll ans_=ans;
    cout << ans_ << endl;
}

int main(){
	std::ios::sync_with_stdio(false);
	std::cin.tie(0);
	Solve();
	return 0;
}

Submission Info

Judge Result