#include<iostream>
#include<cstdio>
#include<cctype>
using namespace std;
inline void in(int &x){
    x=0;int f=1;char t=getchar();
    while(!isdigit(t)){if(t=='-')f=-1;t=getchar();}
    while(isdigit(t)){x=x*10+t-48;t=getchar();}
    x*=f;
}
const int maxn=2510;
int n,m,minn;
int a[maxn],f[maxn];
inline void dpwork(){
	fill(f+1,f+n+1,0xfffffff);
	for(int i=1;i<=n;i++)
	 for(int j=1;j<=i;j++)
	  f[i]=min(f[i],i==j? f[i-j]+a[j]:f[i-j]+a[j]+m);
}
inline void work(){
	in(n);in(m);a[0]=m;
	for(int i=1;i<=n;i++) in(a[i]),a[i]+=a[i-1];
	dpwork();
	printf("%d",f[n]);
}
inline int mian(){
    freopen("cowriver.in","r",stdin);
	freopen("cowriver.out","w",stdout);
	work();
}
int Rose=mian();
int main(){;}