import sys
n=int(input());a=list(map(int,input().split()));p=0;o=0
for i in range(1,91):
p+=1;l=i in a
if l==True:
p=0;o=i
if p==15:
print(p+o)
sys.exit()
print(90)
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
#define SPEED ios::sync_with_stdio(0), cin.tie(0), cout.tie(0)
int main()
{
SPEED;
int n , ans = 0;
cin>>n;
int arr[n];
for (int i = 0; i < n; ++i)
cin>>arr[i];
int target = 15;
for (int i = 0; i < n; ++i)
{
if(arr[i] <= target)
target = arr[i] + 15;
}
if(target >= 90)
cout<<90<<endl;
else
cout<<target<<endl;
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