1.
If f(x+y)=f(x)f(y)f(x + y) = f(x)f(y) and ∑x=1∞f(x)=2\sum_{x=1}^{\infty} f(x) = 2, x,y∈Nx, y \in \mathbb{N}, where N\mathbb{N} is the set of all natural numbers, then the value of f(1)f(1) is