#include<bits/stdc++.h>
using namespace std;
typedef long long unsigned int ll;

// definition {{{ 1

// scaning {{{ 2
#define Scd(x) scanf("%d", &x)
#define Scd2(x,y) scanf("%d%d", &x, &y)
#define Scd3(x,y,z) scanf("%d%d%d", &x, &y, &z)

#define Scll(x) scanf("%llu", &x)
#define Scll2(x,y) scanf("%llu%llu", &x, &y)
#define Scll3(x,y,z) scanf("%llu%llu%llu", &x, &y, &z)

#define Scc(c) scanf("%c", &c);
#define Scs(s) scanf("%s", s);
#define Scstr(s) scanf("%s", &s);
// }}} 2

// constants {{{ 2
#define EPS (1e-7)
#define INF (1e9)
#define PI (acos(-1))
// }}} 2

// systems {{{ 2
#define Rep(x,y) for(int x = 0; x < y; x++)
#define Repe(x,y,z) for(int x = z; x < y; x++)
// }}} 2

// output {{{ 2
#define YesNo(a) (a)?printf("Yes\n"):printf("No\n");
// }}} 2

// }}} 1

ll mod = 1000000007;
// PowMod( base, index, modulo) return base ** index % modulo {{{
// PowMod = base ** index % mod ( natural numbers )
long long unsigned int PowMod( long long unsigned int base, long long unsigned int index, long long unsigned int modulo = mod ){
    if( index == 0 ) return 1;
    // O( log(index) )
    if( index % 2 ){
        return base * PowMod(base, index - 1, modulo) % modulo;
    }else{
        long long unsigned int Phalf = index / 2;
        long long unsigned int half = PowMod(base, Phalf, modulo);
        return half * half % modulo;
    }
}
// }}}

int main() {

    int N;
    Scd( N );
    ll a[100023];
    Rep(i,N){
        Scll( a[i] );
    }

    ll c;
    // (N-1)Ci
    c = 1;
    ll ans = 0;
    Rep(i,N){
        ans += a[i]*c;
        ans %= mod;
        c = c * (N-i-1) * PowMod( i+1, mod-2 ) % mod;
    }
    printf ("%lld\n", ans );


    return 0;
}