while True:
try:
N=int(input())
res=[]
for i in range(7,N+1):#如果直接用range(N+1)的话,会将0也算进去,所以从7开始最保险
if '7' in str(i) or i%7==0:
res.append(i)
print(len(res))
except:
break
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main(){
int N;
while(cin >> N){
int count=0;
string str;
for(int i=7;i<=N;i++){
stringstream a;
a << i;
a >> str;
if(str.find('7')!=str.npos || i%7==0)
count++;
}
cout << count << endl;
}
return 0;
} #include <iostream>
using namespace std;
int main(){
int N;
while(cin >> N){
int count=0;
if(N<7)
count=0;
else{
for(int i=7;i<=N;i++){//先判断是否能被7整除,之后依次判断个位、十位、百位、千位...各个位是否为7
if(i%7==0 || i%10==7 || (i%100)/10==7 || (i%1000)/100==7||(i%10000)/1000==7)
count++;
}
}
cout << count << endl;
}
return 0;
}