int n,max=0,t;
scanf("%d",&n);
int a [n], i, k; // this a [n] need to be defined after the input value of n, not otherwise defined.
for(i=1;i<=n;i++)
a [i] = 0; // Application n values
for(k=1;k<=n;k++)
{ scanf("%d",&t);
a[k]=t;
}
for(i=1;i<=n;i++)
{ if(max<a[i])
max=a[i];
}
printf("%d",max);