#include<bits/stdc++.h>
using namespace std;
const int N=2e6+5,mod=1e9+7;
int t,tree[4*N],n,a[N],lazy[4*N],ans,D,removed[N],mn[N][24];
pair<int,int> tr[4*N];
pair<int,int> w[4*N];
void build(int u,int l,int r){
if(l==r) {
tree[u] = a[l] - l; tr[u].second = l;
return;
}
int mid=(l+r)/2;
build(2*u,l,mid);
build(2*u+1,mid+1,r);
tree[u] = min(tree[2*u],tree[2*u+1]);
tr[u].second = l;
}
void update(int u,int start,int end,int l,int r,int val) {
if(lazy[u]) {
tr[u].first += lazy[u];
if(l!=r){
lazy[2*u] += lazy[u];
lazy[2*u+1] += lazy[u];
}
lazy[u] = 0;
}
if(l>end || r<start) return;
if(start<=l && r<=end) {
lazy[u] = val;
tr[u].first += lazy[u];
if(l!=r){
lazy[2*u] += lazy[u];
lazy[2*u+1] += lazy[u];
}
lazy[u] = 0;
return;
}
int mid = (l+r)/2;
update(2*u,start,end,l,mid,val);
update(2*u+1,start,end,mid+1,r,val);
tr[u] = max(tr[2*u],tr[2*u+1]);
}
void insert(int u,int ind,int l,int r,int st,int en) {
if(l>ind || r<ind) return;
if(l==r) {
w[u] = {st,en};
return;
}
int mid = (l+r)/2;
insert(2*u,ind,l,mid,st,en);
insert(2*u+1,ind,mid+1,r,st,en);
w[u] = min(w[2*u],w[2*u+1]);
}
pair<int, int> get(int u,int start,int end,int l,int r) {
if(l>end || r<start) return {n+5,0};
if(start <= l && r <= end) {
return w[u];
}
int mid=(l+r)/2;
return min(get(2*u,start,end,l,mid),get(2*u+1,start,end,mid+1,r));
}
signed main(){
ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
cin>>n>>D>>t;
for(int i=1;i<=n;i++) {
cin >> a[i];
mn[i][0] = a[i] - i;
}
int Lg = log2(n) + 1;
for(int i=1;i<=Lg;i++) {
for(int j=1;j<=n;j++) {
if(j+(1<<(i-1)) <= n)mn[j][i] = min(mn[j][i-1],mn[j+(1<<(i-1))][i-1]);
else mn[j][i] = mn[j][i-1];
}
}
build(1,1,n);
for(int i=1;i<=n;i++){
int l = 1, r =i,ind = 0;
while(l<=r){
int mid=(l+r)/2;
int lg = log2(i-mid+1);
if(min(mn[i-(1<<lg)+1][lg],mn[mid][lg]) <= t-i) {
ind = mid;
l = mid + 1;
}
else r = mid - 1;
}
if(ind) ans++;
if(ind && ind!=i) {
update(1,ind+1,i,1,n,1);
insert(1,i,1,n,ind+1,i);
}
else {
insert(1,i,1,n,n+1,i);
}
} int b = 0;
int cnt = 0;
while(tr[1].first && D) {
int c = tr[1].second; D--; ans -= tr[1].first;
while(get(1,c,n,1,n).first <= c) { cnt++;
if(cnt > n) return 0;
pair<int,int> g = get(1,c,n,1,n);
insert(1,g.second,1,n,n+1,g.second); removed[g.second] = 1;
b ++ ;
update(1,g.first,g.second,1,n,-1);
}
}
cout<<ans;
}
