luci

#include <cstdio>

#define MAXN 100000

int N, M, K;
bool L[MAXN + 1];

int luce() {
    int totale = 0;
    for(int j = 0; j < N; j += M) {
        int res = 0;
        for(int i = j; i < M+j; i++) if(L[i]) ++res;
        if(res < K) totale += K - res;
    }
    return totale;
}

int main() {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    scanf("%d%d%d", &N, &M, &K);
    for(int i = 0; i < N; i++) scanf("%d", &L[i]);
    printf("%d", luce());
    return 0;
}