#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <utility>
#include <functional>
#include <climits>
#include <cstring>

using namespace std;

#define int long long
#define rep(i, n) for (int i=0;i<(int)n;++i)
#define rep1(i, n) for (int i=1;i<=(int)n;++i)
#define unless(a) if(!(a))
#define all(a) begin(a),end(a)
#define fst first
#define scd second
#define PB emplace_back
#define PPB pop_back

using ll=long long;
using vi=vector<int>;
using pii=pair<int, int>;

constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }
bool chmin(int&a,int b){return a>b?(a=b,true):false;}
bool chmax(int&a,int b){return a<b?(a=b,true):false;}
ll read(){ll a;scanf("%lld",&a);return a;}

const int inf = TEN(9) + 10;
const int mod = TEN(9) + 10;

string s;

signed main()
{
	cin>>s;
	bool f=false;
	rep(i,3)if (s[i]=='7')f=true;
	cout<<(f?"Yes":"No")<<endl;
}


