This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	int n;cin>>n;
	int a[55][55];
	for(int i=0;i<55;i++){
		for(int j=0;j<55;j++){
			a[i][j]=0;
		}
	}
	for(int i=0;i<n;i++){
		int h;cin>>h;
		for(int j=0;j<h;j++){
			a[i][j]=1;
		}
	}
	int ans=0;
	for(int i=0;i<55;i++){
		for(int j=0;j<55;j++){
			for(int x=0;x<55;x++){
				if(x+i>=55)break;
				for(int y=0;y<55;y++){
					if(y+j>=55)break;
					bool v=1;
					for(int xx=x;xx<=x+i;xx++){
						for(int yy=y;yy<=y+j;yy++){
							if(a[xx][yy]==0){
								v=0;break;
							}
						}
					}
					if(v==1)ans++;
				}
			}
		}
	}
	cout<<ans;
}
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