import std.stdio, std.conv, std.string, std.array, std.range, std.algorithm, std.container;
import std.math, std.random, std.bigint, std.datetime, std.format;
void main(string[] args){ if(args.length > 1) if(args[1] == "-debug") DEBUG = 1; solve(); }
void log()(){ writeln(""); } void log(T, A ...)(T t, lazy A a){ if(DEBUG) write(t, " "), log(a); } bool DEBUG = 0; 
string read(){ static string[] ss; while(!ss.length) ss = readln.chomp.split; string res = ss[0]; ss.popFront; return res; }
T rtype(T)(){ return read.to!T; } alias rint = rtype!int, rlong = rtype!long, rreal = rtype!real;
T[] rtypes(T)(int n){ return n.iota.map!(i => rtype!T()).array; } alias rint = rtypes!int, rlong = rtypes!long, rreal = rtype!real;

// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- //

void solve(){
	int n = rint;
	long[] as = rlong(n); 
	
	long ans;
	long limit = 0;
	foreach(i; 0 .. n){
		long a = as[i];
		log("i:", i, "a:", a, "limit:", limit, "ans:", ans);
		if(a <= limit) continue;
		else if(a == limit + 1) limit += 1;
		else if(limit == 0) ans += a - 1, limit += 1;
		else ans += (a - 1) / (limit + 1);
		log(" -> ", "limit:", limit, "ans:", ans);
	}
	
	ans.writeln;
}
