// Lucas + CRT
#include <cstdio>
#include <cstring>
using namespace std;
char s[100005];
int C[10][10], a[100005], N, R5_1, R2_1, R5_2, R2_2;
int Lucas(int m, int n, int p)
{
int Res = 1;
while (m && Res) Res *= C[m % p][n % p] % p, n /= p, m /= p, Res %= p;
return Res;
}
int Pow(int a, int P)
{
int Res = 1;
for (int i = 1; i <= P - 2; i ++) Res *= a, Res %= P;
return Res;
}
int C2[100005], C5[100005];
int main()
{
scanf("%s", s);
N = strlen(s);
for (int i = 0;i < N; i ++) a[i] = s[i] - '0';
C[0][0] = 1;
for (int i = 1; i <= 5; i ++)
{
C[i][0] = 1;
for (int j = 1; j <= i; j ++) C[i][j] = C[i - 1][j] + C[i - 1][j - 1];
}
for (int i = 0; i < N - 1; i ++) C2[i] = Lucas(N - 2, i, 2), C5[i] = Lucas(N - 2, i, 5);
int i5 = Pow(5, 2), i2 = Pow(2, 5);
for (int i = 0; i < N - 1; i ++)
{
R5_1 += a[i] * C5[i], R2_1 += a[i] * C2[i];
R5_2 += a[i + 1] * C5[i], R2_2 += a[i + 1] * C2[i];
R5_1 %= 5, R5_2 %= 5, R2_1 &= 1, R2_2 &= 1;
}
int B1 = R2_1 * 5 * i5 + R5_1 *2 * i2, B2 = R2_2 * 5 * i5 + R5_2 *2 * i2;
B1 %= 10, B2 %= 10;
int Res = B1 * 10 + B2;
if (Res == 0) Res = 100;
printf("%d\n", Res);
return 0;
}