1-2 Fibonacci sequence

#include <cstdio>

void R(int f1, int f2, int k);

int N;

int main() {
scanf("%d", &N);
printf("F(1)=1\nF(2)=1\n");
R(1, 1, 3);
return 0;
}

void R(int f1, int f2, int k) {
if(k == N+1) {
return;
} else {
printf("F(%d)=%d\n", k, f1+f2);
R(f2, f1+f2, k+1);
}
return;
}