#include <cstdio> #include <cstring> #include <algorithm> using namespace std; const int N = 405; int dp[2][N][N];//dp(i,j,k)表示前i天工作了j天且已经连续工作了k天花费的最小体力值 char s[N]; int n,m; int main(){ scanf("%d%d",&n,&m); scanf("%s",s + 1); memset(dp,0x3f,sizeof(dp)); dp[0][0][0] = 0; for(int i = 1;i <= n;i++){ for(int j = 0;j <= i;j++){ dp[i & 1][j][0] = dp[i-1 & 1][j][0]; for(int k = 1;k <= j;k++){ dp[i & 1][j][0] = min(dp[i & 1][j][0],dp[i-1 & 1][j][k]); if(s[i] == '1'){ dp[i & 1][j][k] = min(dp[i & 1][j][k],dp[i-1&1][j-1][k-1] +k); } } } } for(int i = n;i >= 0;i--){ for(int j = 0;j <= i;j++){ if(dp[n & 1][i][j] <= m){ printf("%d\n",i); return 0; } } } return 0; }