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#include<cstdio>

using namespace std;

int main(){
	
	int tab[201720];
	
	for(int i = 0; i<201720; i++) {
		tab[i] = 0;
	}
	
	int n;
	
	scanf("%d", &n);
	
	int coin;
	
	for(int i = 0; i<n; i++) {
		scanf("%d", &coin);
		tab[coin]++;
	}	
	
	int max = 0;
	for(int i = 0; i<=201718; i++) {
		if(tab[i] == 0){
			continue;
		}
		max = i;
		int count = tab[i]/2;
		tab[i+1] += count;
	}
	
	int t = tab[201718];
	
	while(t > 1){
		t = t/2;
		max++;
	}	
	
	printf("%d", max);

	return 0;
}