0分不解

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    freopen("apple.in","r",stdin);
    freopen("apple.out","w",stdout);
    int i,j;
    int a[11],tt,sum=0;
    for(i=1;i<=10;i++)
    {
        cin>>a[i];
    }
    cin>>tt;
    tt=tt+30;
    for(i=1;i<=10;i++)
    {
        if(tt>=a[i])    sum++;
    }
    cout<<sum<<endl;
    return 0;
}