#include #include #include #include using namespace std; int n,p; int a[100010]; int s[100010],w[100010]; long long ans;

int main() { while(cin>>n&&n) { ans=0; p=0; for(int i=1;i<=n;i++) scanf("%d",&a[i]); a[n+1]=0; for(int i=1;i<=n+1;i++) { if(a[i]>s[p]) s[++p]=a[i],w[p]=1; else{ int width=0; while(s[p]>a[i]) { width+=w[p]; ans=max(ans,(long long)width*s[p]); p--; } s[++p]=a[i],w[p]=width+1; } } cout<<ans<<endl; } }