
#include<bits/stdc++.h>
#define pb push_back
#define rep(i,a,b) for(int i=a;i<=b;++i)
#define per(i,b,a) for(int i=b;i>=a;--i)
#define gcd(a,b) __gcd(a,b)
#define MEM(a,x) memset(a,x,sizeof(a))
#define VI vector<int>
#define PII pair<int,int>
#define ull unsigned long long
#define ll long long
#define fi first
#define se second
#define INF 0x3f3f3f3f
using namespace std;
const int N=2e5+5;
template<class T>inline void read(T &res)
{
char c;T flag=1;
while((c=getchar())<'0'||c>'9')if(c=='-')flag=-1;res=c-'0';
while((c=getchar())>='0'&&c<='9')res=res*10+c-'0';res*=flag;
}
int n;
int main(){
    cin>>n;
    int ok=0;
    while(n){
        if(n%10==7)ok=1;
        n/=10;
    }
    if(ok)puts("Yes");
    else puts("No");
	return 0;
}
