#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
const int N = 5000500, mod = 1e9 + 7;
int minFac[N];
long long dp[N];
int main()
{
    for (int i = 0; i < N; i++) minFac[i] = i;
    for (int i = 2; i * i < N; i++)
        if (minFac[i] == i)
            for (int j = i * i; j < N; j += i)
                minFac[j] = min(minFac[j], i);
    memset(dp, 0x3f, sizeof(dp));
    dp[1] = 0;
    for (int i = 2; i < N; i++)
        for (int x = i; x != 1; x /= minFac[x])
            dp[i] = min(dp[i], dp[i / minFac[x]] + i * (minFac[x] - 1ll) / 2);
    int t, l, r;
    scanf("%d%d%d", &t, &l, &r);
    long long ans = 0, cnt = 1;
    for (int j = l; j <= r; j++)
    {
        dp[j] %= mod;
        ans = (ans + cnt * dp[j]) % mod;
        cnt = (cnt * t) % mod;
    }
    printf("%lld", ans);
    return 0;
}