#include <stdio.h> int main() { int a, b = 0; while(scanf("%d",&a)!=EOF) { b = 0; for(int i = 1;i<=a;i++) { int tem = i; if(i%7 == 0) b++; else while(tem) { if(tem%10 == 7) { b++; break; } tem/=10; } } printf("%d",b); } }
