C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n=10,t,sum=0;
    int a[n];
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    cin>>t;
    for(int j=0;j<n;j++){
        if(t+30>=a[j])
        sum=sum+1;
    }
    cout<<sum<<endl;
    return 0;
}

Python :

# coding=utf-8
x = input().split()
n=int(input())
m=n+30
s=0
for i in x:
    if int(i)<=m:
        s+=1
print(s)