C :

#include<stdio.h>
 
unsigned int ComputeAge(unsigned int n) {
    if (n == 1) {
        return 10;
    }
    return ComputeAge(n - 1) + 2;
}
 
int main() {
    unsigned int n;
    scanf("%u", &n);
    printf("The person's age is %u\n", ComputeAge(n));
 
}