/****************#####    بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيم   #####********************
__________________________________________________________________________
######################  Ya-Seen Arafat(ACWizard) #########################
######################        UAP-CSE-33B        #########################
*************************************************************************/
#include <bits/stdc++.h>
#define sc(n) scanf("%d", &n)
#define S 303
using namespace std;
typedef long long LL;

int n, low, high;
int make[S];
LL dp[S][S][S];

LL Pay(int ind, int tot, int term){
    if(term > high)return 0LL;
    if(tot < 0)return 0LL;
    if(term >= low && term <= high && tot == 0)return 1LL;
    if(dp[ind][tot][term] != -1)return dp[ind][tot][term];
    dp[ind][tot][term] = 0;
    for(int i = ind; i < n; i++){
        dp[ind][tot][term] += Pay(i, tot-make[i], term+1);
    }
    return dp[ind][tot][term];
}

void Do(){
    string str;
    while(getline(cin, str)){
        istringstream cinn(str);
        int sz = str.size();
        int sp = 0;
        for(int i = 0; i < sz; i++)if(str[i] == ' ')sp++;
        if(sp == 0)cinn >> n, low = 1, high = n;
        if(sp == 1)cinn >> n, cinn >> high, low = 1;
        if(sp == 2)cinn >> n, cinn >> low, cinn >> high;
        for(int i = 0; i < n; i++)make[i] = i+1;
        reverse(make, make+n);
        memset(dp, -1, sizeof(dp));
        cout << Pay(0, n, 0) << endl;
    }
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    #ifndef ONLINE_JUDGE
    ///freopen("inp","r",stdout);
    ///freopen("contest.txt","w",stdout);
    #endif
    Do();
    return 0;
}