var pc = [0,0];
var registers = [{p: 0}, {p: 1}];
var lastsnd = [0,0];
var queue = [[],[]];
var instructions = require("fs").readFileSync("input.txt").toString().split("\n").filter((a)=>(a));
var deadlock = 0;
var numSends = [0, 0];
while(deadlock < 2){
	deadlock = 0;
	for(var p = 0; p <= 1; p++){
		if((pc[p] >= 0) && (pc[p] < instructions.length)){
			val = a => ((isNaN(parseInt(a))) ? (registers[p][a]) : (parseInt(a)));
			var instruction = instructions[pc[p]];
			var parts = instruction.split(" ");
			switch(parts[0]){
				case "snd":
					numSends[p]++;
					queue[1-p].push(val(parts[1]));
					break;
				case "set":
					registers[p][parts[1]] = val(parts[2]);
					break;
				case "add":
					registers[p][parts[1]] += val(parts[2]);
					break;
				case "mul":
					registers[p][parts[1]] *= val(parts[2]);
					break;
				case "mod":
					registers[p][parts[1]] = registers[p][parts[1]] % val(parts[2]);
					break;
				case "rcv":
					if(queue[p].length >= 1){
						registers[p][parts[1]] = queue[p].splice(0,1)[0];
					}
					else{
						pc[p]--;
						deadlock++;
					}
					break;
				case "jgz":
					if(val(parts[1]) > 0){
						pc[p] += (val(parts[2]) - 1);
					}
					break;
			}
			pc[p]++;
		}
		else{
			deadlock++;
		}
	}
}
console.log(numSends[1]);