#include <stdio.h>
int main(void){
    long int x,y,z;
    scanf("%ld%ld%ld",&x,&y,&z);
    if (y<=z) {
        printf("%ld\n",z-2);
    } else if (x<=z) {
        printf("%ld\n",z-1);
    } else {
        printf("%ld\n",z);
    }
    return 0;
}