func_code_string: #include <bits/stdc++.h>   using namespace std;   int cnt[100100];   int R[100100];   int n;   long long power(long long a, long long b) {     long long res = 1;     while (b) {       if (b & 1) res = (res * a) % 1000000007;       a = (a * a) % 1000000007;       b >>= 1;     }     return res;   }   int main() {     memset(cnt, 0, sizeof(cnt));     scanf( %d , &n);     int maxA = 0;     for (int i = 1; i <= n; i++) {       int tmp;       scanf( %d , &tmp);       cnt[tmp]++;       maxA = max(maxA, tmp);     }     for (int i = maxA; i >= 1; i--) cnt[i] += cnt[i + 1];     long long ans = 0;     for (int i = 1; i <= maxA; i++) {       int tot = 0;       for (int j = 1; j * j <= i; j++) {         if (i % j == 0) {           R[tot++] = j;           if (j * j != i) {             R[tot++] = i / j;           }         }       }       sort(R, R + tot);       long long tmp =           (power(tot, cnt[R[tot - 1]]) -            power(tot - 1, cnt[R[tot - 1]]) % 1000000007 + 1000000007) %           1000000007;       for (int j = 0; j < tot - 1; j++)         tmp = (tmp * power(j + 1, cnt[R[j]] - cnt[R[j + 1]])) % 1000000007;       ans = (ans + tmp) % 1000000007;     }     printf( %I64d n , ans);     return 0;   }   