#pragma GCC target("avx")  // CPU 処理並列化
 #pragma GCC optimize("O3")  // CPU 処理並列化
 #pragma GCC optimize("unroll-loops")  // 条件処理の呼び出しを減らす
// #define BEGIN_STACK_EXTEND(size) void * stack_extend_memory_ = malloc(size);void * stack_extend_origin_memory_;char * stack_extend_dummy_memory_ = (char*)alloca((1+(int)(((long long)stack_extend_memory_)&127))*16);*stack_extend_dummy_memory_ = 0;asm volatile("mov %%rsp, %%rbx\nmov %%rax, %%rsp":"=b"(stack_extend_origin_memory_):"a"((char*)stack_extend_memory_+(size)-1024));
// #define END_STACK_EXTEND asm volatile("mov %%rax, %%rsp"::"a"(stack_extend_origin_memory_));free(stack_extend_memory_);

#include<stdio.h>
#include<math.h>
#include<algorithm>
#include<queue>
#include<deque>
#include<stack>
#include<string>
#include<string.h>
#include<vector>
#include<set>
#include<map>
#include<bitset>
#include<stdlib.h>
#include<cassert>
#include<time.h>
#include<bitset>
#include<numeric>
#include<unordered_set>
#include<unordered_map>
#include<complex>
using namespace std;
const long long mod=1000000007;
const long long inf=mod*mod;
const long long d2=(mod+1)/2;
const double EPS=1e-9;
const double INF=1e+10;
const double PI=acos(-1.0);
const int C_SIZE = 3100000;
const int UF_SIZE = 3100000;
namespace{
	long long fact[C_SIZE];
	long long finv[C_SIZE];
	long long inv[C_SIZE];
	inline long long Comb(int a,int b){
	 	if(a<b||b<0)return 0;
	 	return fact[a]*finv[b]%mod*finv[a-b]%mod;
	}
	void init_C(int n){
		fact[0]=finv[0]=inv[1]=1;
		for(int i=2;i<n;i++){
			inv[i]=(mod-(mod/i)*inv[mod%i]%mod)%mod;
		}
		for(int i=1;i<n;i++){
			fact[i]=fact[i-1]*i%mod;
			finv[i]=finv[i-1]*inv[i]%mod;
		}
	}
	long long pw(long long a,long long b){
		if(a<0LL)return 0;
		if(b<0LL)return 0;
		long long ret=1;
		while(b){
			if(b%2)ret=ret*a%mod;
			a=a*a%mod;
			b/=2;
		}
		return ret;
	}
	long long pw_mod(long long a,long long b,long long M){
		if(a<0LL)return 0;
		if(b<0LL)return 0;
		long long ret=1;
		while(b){
			if(b%2)ret=ret*a%M;
			a=a*a%M;
			b/=2;
		}
		return ret;
	}
	int pw_mod_int(int a,int b,int M){
		if(a<0)return 0;
		if(b<0)return 0;
		int ret=1;
		while(b){
			if(b%2)ret=(long long)ret*a%M;
			a=(long long)a*a%M;
			b/=2;
		}
		return ret;
	}
	int ABS(int a){return max(a,-a);}
	long long ABS(long long a){return max(a,-a);}
	double ABS(double a){return max(a,-a);}
	int sig(double r) { return (r < -EPS) ? -1 : (r > +EPS) ? +1 : 0; }
	int UF[UF_SIZE];
	void init_UF(int n){
		for(int i=0;i<n;i++)UF[i]=-1;
	}
	int FIND(int a){
		if(UF[a]<0)return a;
		return UF[a]=FIND(UF[a]);
	}
	void UNION(int a,int b){
		a=FIND(a);b=FIND(b);if(a==b)return;
		// if(UF[a]>UF[b])swap(a,b);
		UF[a]+=UF[b];UF[b]=a;
	}
}
// ここから編集しろ
char in[1510][1510];
int p[1510][1510];
int ks[1510][1510];
int L[1510][1510];
int R[1510][1510];
int fr[1510][1510];
int main(){
	int a;scanf("%d",&a);
	for(int i=0;i<a;i++){
		scanf("%s",in[i]);
	}
	for(int i=0;i<a;i++)for(int j=0;j<a;j++){
		if(in[i][j]=='#')continue;
		p[i][j]=in[i][j]-'0';
	}
	long long ret=0;
	for(int i=0;i<a;i++)for(int j=0;j<a;j++){
		fr[i][j]=a;
		if(p[i][j]==0){
			for(int k=0;k<=i;k++){
				L[j][k]=a;
				R[j][k]=-1;
			}
			continue;
		}
		fr[i][j]=i;
		if(i)fr[i][j]=min(fr[i][j],fr[i-1][j]);
		if(j)fr[i][j]=min(fr[i][j],fr[i][j-1]);
		if(i)ks[i][j]+=ks[i-1][j];
		if(j)ks[i][j]+=ks[i][j-1];
		if(i&&p[i-1][j]&&j&&p[i][j-1]){
			L[j][i]=L[j-1][i];
			R[j][i]=j;
			int r=a;
			for(int k=i-1;k>=fr[i][j];k--){
				if(R[j-1][k]>=L[j][k]&&r>R[j-1][k]){
					ks[i][j]-=ks[k][R[j-1][k]];
				}
				r=min(r,L[j][k]);
				L[j][k]=min(L[j][k],L[j-1][k]);
				R[j][k]=max(R[j][k],R[j-1][k]);
			}
		}else if(i&&p[i-1][j]){ // ue ga aiteru
			L[j][i]=R[j][i]=j;
		}else if(j&&p[i][j-1]){ // hidari ga aiteru
			for(int k=0;k<=i;k++){
				L[j][k]=L[j-1][k];
				R[j][k]=R[j-1][k];
			}
			R[j][i]=j;

		}else{
			L[j][i]=R[j][i]=j;
		}

		ret+=ks[i][j]*p[i][j];
		ks[i][j]+=p[i][j];
		// printf("%d ",ks[i][j]);
		// if(j==a-1)printf("\n");
	}

	printf("%lld\n",ret);
}

Measured memory_bytes: 24960