17 lines
362 B
C
17 lines
362 B
C
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#include <stdio.h>
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int main(void){
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int m,n;
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scanf("%d %d",&m,&n);//m is line.
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int i, all = m * n, line,sum = 0,num,asum = 0;
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for(i = 0; i < all; i++){
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scanf("%d",&num);
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asum += num;
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line = i/n;
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if(!line || line == m-1) sum += num;
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else if(!(i - line*n) || !((i+1) - (line+1)*n)) sum += num;
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}
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printf("%d\n",asum - (asum - sum)*2);
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return 0;
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}
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