题解 | #挑7#
挑7
http://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
```const keynum=parseInt(readline())
var num=0
for(var i=1;i<=keynum;i++){
if(i%7==0){
num++
}else if(i.toString().indexOf(7)>=0){
num++
}
}
console.log(num)
