#include<stdio.h>
long long int a[1003][1003];
long long int dp[1003][1003];
int main()
{
	long long int n, m;
	scanf("%lld %lld", &n, &m);
	long long int i, j;
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++)
			scanf("%lld", &a[i][j]);
	for (j = 0; j < m; j++)
		dp[0][j] = a[0][j];
	long long int min = 0;
	for (i = 1; i < n; i++)
	{
		for (j = 0; j < m; j++)
			dp[i][j] = dp[i - 1][j] + a[i][j];
		min = 1e18;
		for (j = 0; j < m; j++)
			if (min > dp[i][j])
				min = dp[i][j];
		for (j = 0; j < m; j++)
			if (dp[i][j] > min + a[i][j])
				dp[i][j] = min + a[i][j];
	}
	printf("%lld\n", min);
	return 0;
}