求助！！！！！！！！！！

#include<bits/stdc++.h>
using namespace std;
#define lll long long
lll read(){
    lll sign=1,num=0;
    char ch=getchar();
    while(ch<'0' || ch>'9'){
        if(ch=='-') sign=-1;
        ch=getchar();
    }
    while(ch>='0' && ch<='9'){
        num=num*10+ch-'0';
        ch=getchar();
    }
    return num*sign;
}
void write(lll x){
    if(x<0){
        putchar('-');
        x=~x+1; // 相当于 x=-x
    }
    if(x>9) write(x/10);
    putchar(x%10+'0');
}
lll a[1000005],b[1000005],c[1000005];
int main()
{
    lll n,m;
    n = read(),m = read();
    for(int i = 1;i<=n;i++)
    {
        a[i] = read();
    }
    for(int i = 1;i<=n;i++)
    {
        b[i] = max(b[i-1]+a[i],a[i]);
    }
    c[1] = b[1];
    lll mx = c[1];
    int maxxx = 1;
    lll maxx = c[1]*2;
    for(int i = 2;i<=n;i++)
    {
        c[i] = maxx;
        if(c[i]+b[maxxx]>maxx)
        {
            maxx = c[i]+b[maxxx];
            maxxx = i;
        }
        maxx = max(c[i]+b[i],maxx);
        mx = max(mx,c[i]);
    }
    write(mx%m);
    return 0;
}