33 lines
586 B
C++
33 lines
586 B
C++
|
#include <cctype>
|
||
|
|
#include <cstdio>
|
||
|
|
#include <iostream>
|
||
|
|
using namespace std;
|
||
|
|
typedef long long ll;
|
||
|
|
|
||
|
|
ll readint(){
|
||
|
|
int x=0,w=1;
|
||
|
|
char ch=0;
|
||
|
|
while(!isdigit(ch)){
|
||
|
|
if(ch=='-')w=-1;
|
||
|
|
ch=getchar();
|
||
|
|
}
|
||
|
|
while(isdigit(ch)){
|
||
|
|
x=x*10+(ch-'0');
|
||
|
|
ch=getchar();
|
||
|
|
}
|
||
|
|
return x*w;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(){
|
||
|
|
const ll n=readint(),m=readint();
|
||
|
|
ll ans{};
|
||
|
|
for(int i=1;i<=n;i++){
|
||
|
|
for(int j=1;j<=m;j++){
|
||
|
|
ll num{readint()};
|
||
|
|
if(i%3==2&&j%3==2){
|
||
|
|
ans+=num;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
printf("%lld",ans);
|
||
|
|
}
|