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#include <iostream>
using namespace std;
int main()
{int n,a[100],sum=0;
cout<<"enter the numbers of buildings that you want: "<<endl;
cin>>n;
for(int i=0;i<=n-1;i++){
cout<<"enter the building height"<<endl;
cin>>a[i];
}
for(int i=0;i<=n-1;i+2){
int j=a[i+1]-a[i];
if(j==a[i+1]){
continue;
}else{
sum=sum+j;
}
}
cout<<"the sum of the water stored is: "<<sum<<endl;
return 0;
}