#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <math.h>
#include <limits.h>
#define Max(a, b) ((a) > (b) ? (a) : (b))
#define Min(a, b) ((a) > (b) ? (b) : (a))
#define abs(x) ((x) > 0 ? (x) : -(x))
#define rep(i, n) for(int i = 0; i < (n); i++)
#define MOD 1000000007 //10^9 + 7
#define endl printf("\n")
typedef long long ll;
#define MAX_N (1 << 17)

int
main(int argc, char **argv)
{
  ll x, y, z;
  scanf("%lld %lld %lld", &x, &y, &z);

  ll ans = z;
  if (x <= z) ans -= 1;
  if (y <= z) ans -= 1;
  printf("%lld\n", ans);

  return 0;
}