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#include <bits/stdc++.h> | |
using namespace std; | |
#define FOR(i, j, k) for(int i = j; i < k; ++i) | |
#define rep(i, j) FOR(i, 0, j) | |
#define FORr(i, j, k) for(int i = j; i >= k; --i) | |
#define repr(i, j) FOR(i, j, 0) | |
#define INF (1 << 30) | |
typedef long long ll; | |
typedef unsigned long long ull; | |
typedef pair<int, int> P; | |
typedef pair<P, int> Pi; | |
const int MOD = 1e9 + 7; | |
const int dy[]={0, 0, 1, -1}; | |
const int dx[]={1, -1, 0, 0}; | |
template <class T> void chmin(T& a, const T& b) { a = min(a, b); } | |
template <class T> void chmax(T& a, const T& b) { a = max(a, b); } | |
int main() { | |
int X, A, B; | |
scanf("%d %d %d", &X, &A, &B); | |
int tmp = A - B; | |
if(tmp < 0) { | |
if(abs(tmp) <= X) printf("safe\n"); | |
else printf("dangerous\n"); | |
} | |
else printf("delicious\n"); | |
return 0; | |
} |
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